He ________ all his aims. But his efforts in the past few years have been praise-worthy.

A．could have achieved B．wouldn’t have achieved
C．must have achieved D．may not have achieved

D

解析試題分析：考查情態(tài)動(dòng)詞的完成式：句意：他可能不會(huì)達(dá)到所有的目標(biāo)，但是他過(guò)去幾年的努力是值得表?yè)P(yáng)的。could have done，過(guò)去可能做了…，wouldn’t have done過(guò)去本來(lái)不會(huì)做而做了， must have done過(guò)去一定做了，may not have done過(guò)去可能不會(huì)做，選D符合句意。
考點(diǎn)：考查情態(tài)動(dòng)詞的完成式

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