【題目】People _________ cross the road when the traffic lights are red.

A. mustn'tB. needn'tC. mustD. need

【答案】A

【解析】

句意：當交通燈變成紅色時，人們禁止過馬路。A. mustn't禁止；B. needn't需要；C. must必須；D. need需要；根據(jù)when the traffic lights are red.可知是必須不能過馬路；故選A

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