She have gone to Shanghai for a visit. She has been discussing the papers with me for a wh

问题补充：

She have gone to Shanghai for a visit. She has been discussing the papers with me for a whole day.

A. mustn’t

B. needn’t

C. shouldn’t

D. can’t

答案：

A. mustn’t

B. needn’t

C. shouldn’t

(答案→)D. can’t

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