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

A.must have done B.might finish
C.could have finished D.could finish

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---”語氣不十分肯定;could have done意為“本能夠---”;could do 用于虛擬語氣,對(duì)現(xiàn)在或?qū)淼氖虑樘摂M。
考點(diǎn):考查情態(tài)動(dòng)詞的用法。

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