问题描述：
-Was't it Dr Li who spoke to you just now?
-__________________.
A.I didn't know he was.
B.Yes,it was.
C.No,he wasn't
D.Yes,he did.
-__________________.
A.I didn't know he was.
B.Yes,it was.
C.No,he wasn't
D.Yes,he did.
问题解答：
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