Your cousin is said a new computer program recently, but do you know when he will finish it?
A.to designB.to be designing
C.to have been designingD.to have designed
C

試題分析:考查固定結(jié)構(gòu)的含義sb/sth+be+said/reported/thought(過去分詞)+to do/to be doing/to have done, 具體意思為:to do 表將來;to be doing表示正在進行;to have been doing表示從過去一直在進行到現(xiàn)在,并且現(xiàn)在還在進行;to have done表示動作已經(jīng)結(jié)束,發(fā)生在謂動詞之前。句意為:據(jù)說你的堂兄最近在設(shè)計一種新的電腦程序,但是你知道他在什么時候完成嗎?從句意中可知,他設(shè)計了一段時間,但還沒有完成,應(yīng)在進行中,故應(yīng)使用to have been doing的形式,答案應(yīng)為C。
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