He ___________ unwisely, but he was at least trying to do something helpful.

A.may have acted B.must have acted
C.should have actedD.would act

A

解析試題分析:句意:他的行為也許不明智,但是他至少能夠嘗試做一些有幫助的事了。may have done可能已經(jīng)做了;must have done一定做過某事;should have done應(yīng)該應(yīng)經(jīng)做過某事; would done過去將要做。根據(jù)句意故選A。
考點:考查情態(tài)動詞的用法。
點評:本題難度適中。情態(tài)動詞是高中階段的重要的語法項目,需要考生掌握它們的不同的語法及區(qū)別,尤其是情態(tài)動詞的完成式表示對過去的推測,不同的情態(tài)動詞推測的可能性大小上不同,需要考生理解它們的不同的語法。
即學(xué)即練:Why didn’t you tell me there was no meeting today ? I _____ all the way here through the heavy snow.
A. needn’t have drive
B. can’t have driven
C. mustn’t have driven
D. shouldn’t have driven
解析:A。句意:你為什么不告訴我今天沒有會?我本來沒必要冒著大雪開車跑這么多路。Needn’t have done表示本來沒必要。答案為A。

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