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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