I didn’t see her in the musical hall this evening. She have sung at the concert.A. mustn’t

问题补充：

I didn’t see her in the musical hall this evening. She have sung at the concert.

A. mustn’t

B. shouldn’t

C. needn’t

D. couldn’t

答案：

A. mustn’t

B. shouldn’t

C. needn’t

D. couldn’t

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