Tom is said _______ a new computer programme recently, but I don’t know when he will finish it.


  1. A.
    to design
  2. B.
    to be designing
  3. C.
    to have designed
  4. D.
    to have been designing
D
此題考查不定式的幾種時態(tài)的區(qū)別。不定式的一般式表示將要發(fā)生的動作,進行式表示動作正在進行,完成式表示已經(jīng)完成的動作,完成進行式則表示動作從過去到現(xiàn)在這一段時間內(nèi)一直在進行。本題從句沒有確定動作是否已經(jīng)完成,故用不定式的完成進行式。
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