He decided not to say anything at the meeting unless.A. asking to B. to ask to C. asked t

问题补充：

He decided not to say anything at the meeting unless.

A. asking to

B. to ask to

C. asked to

D. ask to

答案：

A. asking to

B. to ask to

(答案→)C. asked to

D. ask to

解析：考查非谓语动词和省略。He与ask之间是动宾关系，即“让他说”，应该用被动，排除A、B、D；句意：他决定在会议上保持沉默，除非被邀请才讲话。unless后省略了he was asked to say something。故选C。