Before I talked with ______ scientist, I
题型：选择题
问题：
Before I talked with ______ scientist, I had never met ______ knowledgeable person like him.
A．a; a
B．the; the
C．the; a
D．a; the
Before I talked with ______ scientist, I had never met ______ knowledgeable person like him.
A．a; a
B．the; the
C．the; a
D．a; the