You cross the road when the traffic lights are red.A. canB. mustC. mustn’tD. needn’t

问题补充：

You cross the road when the traffic lights are red.

A. can

B. must

C. mustn’t

D. needn’t

答案：

A. can

B. must

(答案→)C. mustn’t

D. needn’t

解析：句意：当交通灯是红灯时，你禁止穿过马路。Can能够；must必须；mustn’t禁止；needn’t不需要。