问题标题:
---YouwereoutwhenIdroppedinatyourhouse.---Oh,I________forafriendfromEnglandattheairport.A.waswaitingB.hadwaitedC.amwaitingD.havewaited
问题描述:

---YouwereoutwhenIdroppedinatyourhouse.---Oh,I________forafriendfromEnglandattheairport.

A.waswaiting

B.hadwaited

C.amwaiting

D.havewaited

孙静静回答:
  A
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