Question

—Can I walk across the road now, mum?
— No, you_______. You have to wait until the light turns green.

A．couldn't

B．shouldn't

C．mustn't

D．needn't

Answer 1

C 

本题考查情态动词的用法。因为上句问的是“妈妈，现在我可以穿过马路吗？”下句用mustn’t来表示“不可以”，因为后面的句子说“你得等灯变绿了。”