有关情态动词的一道题there wasn't anyone on the nightclub door so we_ p

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有关情态动词的一道题
there wasn't anyone on the nightclub door so we_ proof of our age.
A didn't need to show B needn't have shown
C couldn't show D mustn't show
为什么选A而不是B?有什么区别?

A表示我们当时不需要出示证件证明年龄.
关于B...动词跟have done是很多的,比如：
Ah..you should have told me!
He might have gone there,I am not sure.
但是need + have done,代表的意思是我们当时做了,但是其实我们不需要这样做的.
比如There wasn't anyone on the nightclub door.Why did you show the proof of your age?You needn't have shown it!
只能说此题的出题思路是考对于need的掌握,其实如果硬是要选B也是说得过去的,但是代表意思和A是相反.A是我们当时没做,B是我们当时做了,但其实不需要那样做的.

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