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问题: 选B为什么不行?

You________Mark anything.It was none of his business.
A.needn't have told
B.mustn't have told
答案是A
选B为什么不行?

解答:

联系前后两句话,应该是你本来不需要或本来没有必要告诉马克任何事,而不是你本来不能或不可以告诉,后句是命令的语气,前句只是一个意见。