3. Tom        a new computer program recently， but I don' t know when he' 11 finish it.(design)

據(jù)說Tom最近在設(shè)計一種新的電腦程序，但我不知道他什么時候完工。

3. is said to have been designing考查不定式的時態(tài)。后半句暗示"設(shè)計"這一動作還在進行，故用不定式的現(xiàn)在完成進行式。現(xiàn)在完成進行時，表示從過去開始的一個動作一直持續(xù)到現(xiàn)在，并且還在進行。

題目來源：高考丟分題英語 > Unit 5 Meeting your ancestors

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