专四
A．didn't succeed
B． wouldn't succeed
C． hadn't succeed
D． wouldn't have succeeded
虚拟语气题。在虚拟语气句子中，可以用介词短语代替条件状语从句，题干中的but for意为“要不是……”，是对过去事实的虚拟，主句动词形式应该是would have done，因此可以判断，[D]选项正确。
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根据以下资料，回答题：
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