You ____ stop when the traffic light turns red.A,had better B,must 为什么填A

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You____stopwhenthetrafficlightturnsred.A,hadbetterB,must为什么填AYou____stopwhenthetrafficlightturnsred.

You ____ stop when the traffic light turns red.A,had better B,must 为什么填A
You ____ stop when the traffic light turns red.A,had better B,must 为什么填A

You ____ stop when the traffic light turns red.A,had better B,must 为什么填A
had better译最好,有劝告或建议；而must译必须,无条件服从,交通规则是必须遵守.故选B