The teacher asked Ben a difficult question in class.A. answerB. answeringC. to answerD. a

问题补充：

The teacher asked Ben a difficult question in class.

A. answer

B. answering

C. to answer

D. answered

答案：

A. answer

B. answering

C. to answer

D. answered

解析：考查动词。句意：老师要求本回答一个很难的问题。Ask sb to do 要求某人做某事，故选C项。