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Although it was the same office Mary.

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Although it was the same office Mary.
Although it was the same office Mary ___ into for an interview two weeks before,on that morning it looked quite different.
A.was shown
B.showed
C.had been shown
D.had shown
请问选什么为什么?
C一般有before 的时候是用完成时态的,ago才是过去时,这里是过去完成时,Mary是被show的,所以用被动