— Has Tom finished his homework yet? — I have no idea he it this morning.A. was doing B.

问题补充：

— Has Tom finished his homework yet?

— I have no idea, he it this morning.

A. was doing

B. did

C. had done

D. would do

答案：

(答案→)A. was doing

B. did

C. had done

D. would do

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