Tony is a quiet student he is active in class.A. so B. and C. butD. or

问题补充：

Tony is a quiet student,he is active in class.

A. so

B. and

C. but

D. or

答案：

A. so

B. and

(答案→)C. but

D. or

解析：考查but用法，quiet和active正好相反，用but表示意思的转折。