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He ________ all his aims. But his efforts in the past few years have been praise-worthy.
A．could have achievedB．wouldn’t have achieved
C．must have achievedD．may not have achieved
D

試題分析：考查情態(tài)動詞的完成式：句意：他可能不會達到所有的目標，但是他過去幾年的努力是值得表揚的。could have done，過去可能做了…，wouldn’t have done過去本來不會做而做了， must have done過去一定做了，may not have done過去可能不會做，選D符合句意。
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