Could you say it again? I can’t understand you are talking about.A. howB. whenC. whatD. w

问题补充：

Could you say it again? I can’t understand you are talking about.

A. how

B. when

C. what

D. which

答案：

A. how

B. when

(答案→)C. what

D. which

解析：how如何，怎样；when什么时候；what什么； which哪一个。句意：你能再说一遍吗？我不能明白你正在说的内容。结合语境可知选C。