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请教教我为什么下面的题目要这么选吧~其他错在哪里?

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请教教我为什么下面的题目要这么选吧~其他错在哪里?
1 Why didn't you tell me you could lend me the money?I _______ it from the bank.
A) haven't needed to borrow
B) will not need to borrow
C) needn't have borrowed
D) didn't need to borrow
C
2 It is vital that enough money ______ to fund the project.
A) be collected
B) must be collected
C) is collected
D) can be collected
A
3 Most electronic devices of this kind,_______ manufactured for such purposes,are tightly packed.
A) that are
B) as are
B
4 He was sure that he was going to _____ something so long as he stuck to his studies.
A) amount to
B) add up to
C) live up to
A
5 When Europeans originally arrived in _______ Texas,the area was inhabited by the Manso peoples.
A) what is now
B) now
C) which now is
D) now is
A
6 Camping ________ include a tent,a sleeping bag,a rucksack,a stove,and so on.
A) equipment
B) facilities
C) instruments
D) devices
B(这几个选项到底有啥区别?)
请教教我为什么下面的题目要这么选吧~其他错在哪里?
1、needn't have done sth 本不必……表虚拟语气,其余都不是虚拟语气
2、 It is vital that +(should)do sth 也是虚拟语气的一种
3、that在句首不可以引导从句,而as可以
4、amount to 达到 add up to 等于 live up to 实行 他确信只要坚持学习,就能有所成就
5、what引导宾语从句
6、equipment设备,装备 facilities 工具