Cars, buses and bikes ________ stop when the traffic lights turn red.
A．canB．mayC．mustD．need
C

試題分析：考查情態(tài)動詞：A. can 能夠， B. may可以，C. must必須，D. need需要，句意：當(dāng)交通燈變紅的時候汽車，公共汽車和自行車必須停止。選C。
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