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Tom ____ have kept his word. I wonder why he changed his mind.
A. must         B. should         C. need          D would
B

試題分析：考查情態(tài)動詞和虛擬語氣。句意：湯姆本應該遵守承諾的。我想知道他為什么改變主意。must have done一定已經做了某事；should have done本應該做某事；need have done本來需要做某事；would have done用于對過去事情的虛擬。根據句意可知，是湯姆沒有遵守承諾，用should表示“本應該”的意思。故選B。
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