Sandy could do nothing but to his teacher that he was wrong.A .admit B. admitted C. admit

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：

解析：考查but的用法，此题中but为介词，它前面的是动词是do、did 、does，but后应用原形动词，若but前面是其它动词，but后应用to do，所以选A。