【題目】— I don't understand why you didn't go to the lecture yesterday afternoon.
—I'm so sorry. But I _________ my homework.
A.had done
B.was doing
C.would do
D.am doing

【答案】B
【解析】句意：——我不懂你為什么沒參加昨天下午的講座。——真抱歉，那時我正在做作業(yè)。根據(jù)時間狀語指 yesterday afternoon“昨天下午”“那時”發(fā)生的事，故用過去進(jìn)行時態(tài)，選B。

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