题目内容

【题目】—Why on earth didn’t you answer the door？I thought you were out this morning.

—I’m terribly sorry，but I online with my brother in America.

A. am chatting B. was chatting

C. chatted D. have been chatting

【答案】B

【解析】根据语境可知，答语意为“很抱歉，但我当时正在和在美国的弟弟网聊”，此处描述的是过去某个时刻正在进行的动作，故用过去进行时。故选B。

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