问题描述：
英语问题—why were you not at zhangxueyou's concert last night?—oh,i for a frend
shanghai at the airport .
A waited B was waiting C have been waiting D had waited
答案是填在I的后面
shanghai at the airport .
A waited B was waiting C have been waiting D had waited
答案是填在I的后面
问题解答：
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