问题补充：
— Wasn it Dr Wang who spoke to you just now?
— .
A. I didn know he was
B. Yes， it was
C. No， he wasn
D. Yes， he did
答案：
A. I didn know he was
(答案→)B. Yes， it was
C. No， he wasn
D. Yes， he did
解析：回答为肯定形式，电话用语用it
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