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While for the bus, I happened to come across my childhood friend, Tom. A.waited

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While for the bus, I happened to come across my childhood friend, Tom. A.waited

While __________ for the bus, I happened to comeacross my childhood friend, Tom.

A.waited            B.wait              C.waiting           D.to wait

 

试题答案

【答案】

C

【解析】

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