You should understand the traffic rule by now. You've had it often enough. A. explaining B. to——青夏教育精英家教网—

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

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You should understand the traffic rule by now. You've had it____ often enough. （05天津卷）　

A. explaining　 B. to explain　　　 C. explain　　　　 D. explained

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