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　考查不定式的時(shí)態(tài)。句意：據(jù)說湯姆最近在設(shè)計(jì)一種新的電腦程序，但我不知道他什么時(shí)候完工。后半句暗示“設(shè)計(jì)”這一動(dòng)作還在進(jìn)行，故用不定式的現(xiàn)在完成進(jìn)行式。

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

[　　]

A．to design
B．to be designing
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  1. A.
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