【題目】Cars, buses, bikes and people ______ stop when the traffic lights are red.

A. can B. may C. must

【答案】C

【解析】句意:當交通燈是紅色時,汽車、公交車、自行車和人們必須停下來。can能,表示能力;may可以,表示允許;must必須,表示要求;根據(jù)when the traffic lights are red.可知交通燈是紅色時,必須停下來,這是交通規(guī)則要求的。故選C。

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