---Didyouasktheguard
来源：语文精选馆 1.73W
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
