Question

Your cousin is said a new computer program recently, but do you know when he will finish it?

A．to design	B．to be designing
C．to have been designing	D．to have designed

Answer 1

C

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