Before I talked with scientist I had never met clever person like him.A. the; aB. a; aC.

问题补充：

Before I talked with scientist, I had never met clever person like him.

A. the; a

B. a; a

C. the; the

D. a; the

答案：

(答案→)A. the; a

B. a; a

C. the; the

D. a; the

解析：此题重点考查冠词的用法；不定冠词有a和an两种：a用于辅音音素开头的词前，an用于元音音素开头的词前。定冠词the，指双方都知道的人或事物。