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-Have the students started to work on their experiment? -Yes, it . A.has done B.

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-Have the students started to work on their experiment? -Yes, it . A.has done B.

—Have thestudents started to work on their experiment?

—Yes, it________.

A.has done

B.is going to be done

C.is to be done

D.is being done

 

试题答案

答案:D

提示:

正在做实验