Question

They went to the ball yesterday , _____ they had a good time.

A.where
B.which
C.at that
D.that

Answer 1

　　选A。
　　They went to the ball yesterday , where they had a good time.

　　他们昨天去参加了舞会，度过了一段愉快的时光。
　　解析： 这里是where 引导的后置定语从句，修饰 the ball。
　　望采纳，祝开心~！