几道英语倒装及强调句选择是,

几道英语倒装及强调句选择是,
1、 The old couple has been married for 40 years and never once() with each other.
A they had quarreled B they have quarreled C have they quarreled D had they quarreled
这题我选的是D,错的,为什么选C,这类题目当中我总是不知道用 “have” 还是用“had” 请问如何分辨
2、 so difficult () it to live in an english-speaking country that i determined to learn english .
A i have felt B have i felt C i did feel D did i feel
这题我选B ,应该选D,与上题同样不知道在have 还是did 两者选择
3、only when your identity has been checked,（）.
A you are allowed in B you will be allowed in C will you allow in D will you be allowed in
这题我选C,为什么选D
4、it was () back home after the experiments.
A not until midnight did he go B until midnight that he didn't go C not until midnight that he went
D until midnight when he didn't go
这题为什么选C,不选B呢,为什么用went
5、() a postgraduate,i would at least master two foreign languages.
A should i become B were i to become C had i become D i should become
为什么用were 不用had 呢
6、() he ill-mannered ,() the laziest and the most irresponsible creature you could ever hope to meet.
A not only is ...but he is also B not only is ...but also C not only is ...but also is he D not only ,.but als o
这题怎么选A,不选B 了的?
一共八道题,可能 有点儿多,还请语法大神留步帮我详细解答下,
7、() a machine been so efficient and accurate as the electronic computer.
A more than ever before B never before has C in the past ,there never has D formerly ther never was
这题就一点也不懂了，
8、Little () about him when i first met him in that company.
A have i known B had i known C do i know D did i know
这题跟一开始几题相似，分不清选had 还是did 还是have

1、 The old couple has been married for 40 years and never once() with each other.
A they had quarreled B they have quarreled C have they quarreled D had they quarreled
这题我选的是D,错的,为什么选C,这类题目当中我总是不知道用 “have” 还是用“had” 请问如何分辨
【这道题你没有注意到时态,and 前半句的时态是现在完成时：has been married,所以后半句的时态应该和它保持一致,也用现在的时态】
2、 so difficult () it to live in an english-speaking country that i determined to learn english .
A i have felt B have i felt C i did feel D did i feel
这题我选B ,应该选D,与上题同样不知道在have 还是did 两者选择
【这是个倒装句,如果你不知道该选have还是did,就把原句改回正常语序,即：I felt it so difficult to live...,所以改为倒装时添加的是助动词did】
3、only when your identity has been checked,（）.
A you are allowed in B you will be allowed in C will you allow in D will you be allowed in
这题我选C,为什么选D
【同第2题,only 开头的句子要用部分倒装,正常的顺序应该是 you will be allowed in,改为倒装时,助动词will 提前】
4、it was () back home after the experiments.
A not until midnight did he go B until midnight that he didn't go C not until midnight that he went
D until midnight when he didn't go
这题为什么选C,不选B呢,为什么用went
【这里考查的是 not...until 的倒装句的用法,你可以把它看做是固定句型,即 It was + not unti' that 从句】
5、() a postgraduate,i would at least master two foreign languages.
A should i become B were i to become C had i become D i should become
为什么用were 不用had 呢
【这里是 if 条件句虚拟语气的用法,完整的句子应该是 If I were a postgraduate】
6、() he ill-mannered ,() the laziest and the most irresponsible creature you could ever hope to meet.
A not only is ...but he is also B not only is ...but also C not only is ...but also is he D not only ,.but als o
这题怎么选A,不选B 了的?
【A和B的不同就在于but also 后面的内容,这句话中 not only...but also...连接的是两个句子,not only 句中的谓语动词是 is,but also 后面也需要谓语动词,所以选 but he is also】
7、() a machine been so efficient and accurate as the electronic computer.
A more than ever before B never before has
C in the past ,there never has D formerly ther never was
这题就一点也不懂了,不知道选什么了
【原题中有个been,所以判断是完成时,从B和C中选,而C选项中的there be 句型使用错误,所以答案选 B,这句话的意思是：以前从来没有像电子计算机一样高效精确的机器】
8、Little () about him when i first met him in that company.
A have i known B had i known C do i know D did i know
这题跟一开始几题相似,分不清选had 还是did 还是have
【跟开始几个题一样,思路就是把倒装改成正常语序,即：I knew little about him when I first met him in that company,表示否定的单词little 提前时,句子用部分倒装,即添加助动词 did,所以答案选D】