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-Can we ski on this mountain? ----Of ourse.However,at no time you do so alone. A

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-Can we ski on this mountain? ----Of ourse.However,at no time you do so alone. A

—Can we ski on this mountain?

----Of ourse.However,at no time _______you do so alone.

A. could B.might C.need D.must

 

试题答案

D

mustn’t表示禁止。

 

标签：ofmountainourseathowever

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