I was at the letter which was to my classmates.A. amaze; amazingB. amazing; amazed C. am

问题补充：

I was at the letter, which was to my classmates.

A. amaze; amazing

B. amazing; amazed

C. amazed; amazing

D. amaze; amaze

答案：

A. amaze; amazing

B. amazing; amazed

(答案→)C. amazed; amazing

D. amaze; amaze

解析：考查amaze的用法。be amazed at对…感到惊讶，主语为人，故第一格应用amazed;第二格表示这封信令人惊讶的，故选C。