He met his previous teacher at abroad.A. by any chanceB. by the chance C. by chanceD. by

问题补充：

He met his previous teacher at abroad.

A. by any chance

B. by the chance

C. by chance

D. by a chance

答案：

A. by any chance

B. by the chance

(答案→)C. by chance

D. by a chance

解析：考察固定搭配。固定搭配by chance偶然，偶尔；其余三项都不是固定搭配。句意：他在船上偶然遇见了自己以前的老师。故C正确。