【題目】—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】根據(jù)語境可知，答語意為“很抱歉，但我當(dāng)時正在和在美國的弟弟網(wǎng)聊”，此處描述的是過去某個時刻正在進(jìn)行的動作，故用過去進(jìn)行時。故選B。

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