---Didyouasktheguard

问题详情：

--- Did you ask the guard _______ happened?

--- Yes, he told me all _______ he knew.

A. what; that       B. what; what      C. which; which         D. that; that

【回答】

 A. what happened是宾语从句. all 之后that he knew是定语从句.先行词是all,所以关系代词只能用that.

知识点：定语从句

题型：选择题