He is said a new machine recently but I don’t know when he will make it. A. to designB.

问题补充：

He is said a new machine recently, but I don’t know when he will make it.

A. to design

B. to be designed

C. to have designed

D. to have been designing

答案：

A. to design

B. to be designed

C. to have designed

(答案→)D. to have been designing

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