his surprise he passed the exam.A. OnB. InC. ToD. At

问题补充：

his surprise, he passed the exam.

A. On

B. In

C. To

D. At

答案：

A. On

B. In

(答案→)C. To

D. At

解析：

试题分析: 句意：使他吃惊的是他通过了考试。To one’s surprise使某人吃惊，固定用法，故选C。