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They have been skating______ 2 hours ago.

A. for B. until

C. since D. after

 

C

【解析】

试题分析:句意:自从两个小时之前,他们就已经在滑冰了。分析:考查现在完成的时间状语,for+段时间; since+ 时间点; since+段时间+ago. 结合选项为第三项。故选 C

考点:考查介词的用法。

 

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