Your cousin is said a new computer programme recently but do you know when he will finis

问题补充：

Your cousin is said a new computer programme 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

答案：

A. to design

B. to be designing

(答案→)C. to have been designing

D. to have designed

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