Sandy could do nothing but to his teacher that he was wrong.A. admitB. admittedC. admitti

问题补充：

Sandy could do nothing but to his teacher that he was wrong.

A. admit

B. admitted

C. admitting

D. to admit

答案：

(答案→)A. admit

B. admitted

C. admitting

D. to admit

解析：考查介词but 用法，but前的动词是do /does/did，but后的动词要用原形动词，所以选A。