【題目】He ______ it on schedule, but somehow he fell behind.

A. must have done B. might finish

C. could have finished D. could finish

【答案】C

【解析】試題分析：句意為：他本能夠按時完成任務(wù)，但他莫名其妙的落后了。must have done 對過去發(fā)生的事情的肯定推測，譯為“一定---”;might do對現(xiàn)在發(fā)生的事情的肯定推測，譯為“也許---”語氣不十分肯定；could have done意為“本能夠---”；could do 用于虛擬語氣，對現(xiàn)在或?qū)淼氖虑樘摂M。

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