【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(shí)完成任務(wù)，但他莫名其妙的落后了。must have done 對(duì)過(guò)去發(fā)生的事情的肯定推測(cè)，譯為“一定---”;might do對(duì)現(xiàn)在發(fā)生的事情的肯定推測(cè)，譯為“也許---”語(yǔ)氣不十分肯定；could have done意為“本能夠---”；could do 用于虛擬語(yǔ)氣，對(duì)現(xiàn)在或?qū)?lái)的事情虛擬。

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