—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．a(chǎn)m waitingD．have waited
A
根據(jù)上句中的時(shí)間狀語的提示可知謂語動詞是指過去某時(shí)正在發(fā)生的事情，因此用過去進(jìn)行時(shí)態(tài)，故答案為 A。
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