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两道英语语法There is less than one month____before the mid-term ex

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两道英语语法
There is less than one month____before the mid-term exam.
A.leaving
B.to leave
C.are left
D.left
我选的是B但答案是D 求详解 这个语法点我不知道
As he had no key to the door,he could do nothing______wait for his father.
A.except
B.except that
C.except to
D.except for
我选的是C但答案是A 请问这四个词有什么区别
两道英语语法There is less than one month____before the mid-term ex
1.leave的过去分词left作后置定语,表示“剩下的”,修饰 less than one month.
2.do nothing except do sth 意为只能做某事
B中except后面跟句子.
C无此用法.
Dfor后面跟名词,代词或动名词.