—Jack you erase the blackboard today ?—But I erased it yesterday. A. have youB. will youC

问题补充：

—Jack, you erase the blackboard today,?

—But I erased it yesterday.

A. have you

B. will you

C. didn’t you

D. don’t you

答案：

A. have you

(答案→)B. will you

C. didn’t you

D. don’t you

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