All the cars ________ stop when the traf...

All the cars ________ stop when the traffic light is red.

A. can B. need C. may D. must

D 【解析】试题分析：句意：在红灯的时候，所有的汽车都必须停下来。本题考查的是情态动词。can 能，会，表示具备某种能力；还有可能的意思；need 需要；may 可以，表示许可；可能；must 必须，语气较强。根据句意，红灯时，汽车必须停下来，这是交通规则，故选D。考点：考查情态动词。

考点分析：

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