单项填空:- Dad,must we wait until the light becomes green?- yes,i'm afraid we ( ).That's the traffic rule.A.can B.may C.have to D.need

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单项填空:- Dad,must we wait until the light becomes green?- yes,i'm afraid we ( ).
That's the traffic rule.A.can B.may C.have to D.need

C 表示必须等到红灯变绿 have to不得不