Do you think the reason he gave is believable?A. whichB. why C. whatD. to which

问题补充：

Do you think the reason he gave is believable?

A. which

B. why

C. what

D. to which

答案：

(答案→)A. which

B. why

C. what

D. to which

解析：考查定语从句。先行词为the reason，从句中he gave 后缺少宾语，所以应使用关系代词which/that，根据四个选项可知选A，句意：你认为他给出的这个原因值得相信吗？