题目内容

For the safety, everyone _________ obey the traffic rules when he is driving or walking.
A．needB．mustC．mayD．could
B

试题分析：句意：为了安全，每个人必须遵守交通安全，当他开车或走路的时候，A. need需要； B. must必须； C. may 可以；D. could能会；结合语境故选B
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