—Can I skate on the lake now? —No, you _...

—Can I skate on the lake now?

—No, you ______. It’s dangerous.

A. can’t B. mustn’t C. needn’t D. won’t

B 【解析】句意：——现在我能在湖上滑冰吗？——不，你禁止，它是危险的。A. can’t不能；B. mustn’t 禁止；C. needn’t不必；D. won’t不会。根据下文It’s dangerous.可知上文是你是禁止的。No, you mustn’t，不，你是禁止的。根据题意，故选B。

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