摘要：( ) You should understand the traffic rule by now. You've had it often enough. A. explaining B. to explain C. explain D. explained [解析]选D 本题考查非谓语动词充当宾语补足语 的用法.在have sth. done结构中."done"与sth. 含有被 动关系.在本题中.the traffic rule与explain有被动关系. 因此.选D.

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