问题描述：
Where were you yesterday?为什么没有介词?
Where were you yesterday?请问这句话有错吗?问你昨天在哪,这句话为什么没有介词?at之类
那Where are you?这句话成立吗
Where were you yesterday?请问这句话有错吗?问你昨天在哪,这句话为什么没有介词?at之类
那Where are you?这句话成立吗
问题解答：
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