题目内容

Tom is said ________ a new computer program recently,but I don't know when he'll finish it.

A.to design   B.to be designing

C.to have been designing   D.to have designed

C 考查不定式的时态。句意:据说汤姆最近在设计一种新的电脑程序,但我不知道他什么时候完工。后半句暗示“设计”这一动作还在进行,故用不定式的现在完成进行式。

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