题目内容

----I called you at 4:00 yesterday afternoon ,but nobody answered.
----Sorry,I____with my friends at that time.
A.swimB.swamC.will swimD.was swimming
D

试题分析:句意:昨天下午我给你打电话了,但是没人接。很抱歉,那时我正在和朋友游泳。at that time是过去进行时的标志词,结合句意,故选D.
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