–Mom may I go swimming with my friends in the river? –No you . That’s too dangerous.A. w

问题补充：

–Mom, may I go swimming with my friends in the river?

–No, you . That’s too dangerous.

A. won’t

B. don’t

C. needn’t

D. mustn’t

答案：

A. won’t

B. don’t

C. needn’t

(答案→)D. mustn’t

解析：此题重点考查情态动词的基本用法，mustn’t表示禁止做某事。