My sister met him at the Grand Theater yesterday afternoon so he lecture.A. mustn’t have

问题补充：

My sister met him at the Grand Theater yesterday afternoon, so he lecture.

A. mustn’t have attended

B. needn’t have attended

C. couldn’t have attended

D. shouldn’t have attended

答案：

A. mustn’t have attended

B. needn’t have attended

(答案→)C. couldn’t have attended

D. shouldn’t have attended

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