摘要： A. needn't have done表示“做了不必要做的事情 .can't have done表示对过去情况的推测. 意为“不可能发生了某事 .mustn't have done 无此用法.shouldn't have done表示“本不应该做的事而做了 .
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“ They went to the lecture, but it had been put off.” “ Oh, so they _______.”
| A．needn’t have gone | B．should have gone |
| C．mustn’t have gone | D．don’t need to go |
“ They went to the lecture, but it had been put off.” “ Oh, so they _______.”
A．needn’t have gone B．should have gone
C．mustn’t have gone D．don’t need to go
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—May I tell this to my close friend?
—No, you . Never let anybody else know about it.
|
A．needn’t |
B．shouldn’t |
C．mustn’t |
D．can’t |
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The weather turned out to be fine yesterday. I the trouble to carry my umbrella.
| A．needn’t take | B．couldn’t take |
| C．needn’t have taken | D．couldn’t have taken |