—You were out when I dropped in at your house yesterday.
—Oh, I________ for a friend from Beijing at the railway station.
A．was waitingB．had waitedC．am waitingD．have waited
A
根據(jù)上句中的時間狀語的提示可知謂語動詞是指過去某時正在發(fā)生的事情，因此用過去進行時態(tài)，故答案為 A。
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