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问题: 解释一下

_____ a pity I didn't see you.

A.It's B.That's C.What's D.There's

老师说答案是A,为什么?

解答:

  简言之----------
It's a pity (that)为固定搭配,其中IT是作形式主语,而真正的主语为:I didn't see you