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You __     _ cross the road when the traffic lights are red. It’s dangerous.
A. needn’t                B. may not                    C. mustn’t
C

试题分析:句意:你千万不要在红灯时过马路,太危险了。A不必B不可以C千万别,一定不要,表示禁止。根据句意,故选C。
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