题目内容

—You were out when I dropped in at your house.
—Oh,I    for a friend from England at the airport.
A.was waitingB.had waited
C.am waitingD.have waited
A
过去进行时可表示过去某一时间正在进行的动作或存在的状态。答语中暗含了when you dropped in at my house。
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