问题描述：
_____?______is a friend of mine.
-------Who's _____?
------- ______is a friend of mine
A:he;It.B:that;It C:it;He D:that;He
-------Who's _____?
------- ______is a friend of mine
A:he;It.B:that;It C:it;He D:that;He
问题解答：
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