Question

【题目】Charlie told his mother all____ had happened.

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

Answer 1

【答案】A

【解析】句意：Charlie告诉他的母亲已经发生的所有的事情。先行词是all，在这里是不定代词，关系词只能用that。根据题意，故选A。