They have been skating______ 2 hours ago.

A. for B. until

C. since D. after

 

C

【解析】

試題分析：句意：自從兩個小時之前，他們就已經(jīng)在滑冰了。分析：考查現(xiàn)在完成的時間狀語，for+段時間； since+ 時間點； since+段時間+ago. 結(jié)合選項為第三項。故選 C

考點：考查介詞的用法。

 

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