英语问题—why were you not at zhangxueyou's concert last night?—oh,i for a frend

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

B请说明原因过去某个时段正在进行的动作。过去进行时。哦,谢谢