---Canwerunacrosstheroadnow?     ­---No,we        ...

问题详情：

      --- Can we run across the road now?

      ­--- No, we                 . We have to wait until the light turns green.

      A. needn't         B. mustn't            C. couldn't        D. shouldn't

【回答】

 B

知识点：情态动词

题型：选择题