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

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。
點(diǎn)評(píng)：本題難度適中。情態(tài)動(dòng)詞是高中階段的重要的語法項(xiàng)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(dòng)詞的完成式表示對過去的推測，不同的情態(tài)動(dòng)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(huì)？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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