Did your father come back early last night?Yes. It was not yet eight o’clock he a

问题补充：

--- Did your father come back early last night?

--- Yes. It was not yet eight o’clock he arrived home.

A. before

B. when

C. that

D. until

答案：

A. before

(答案→)B. when

C. that

D. until

解析：这是一组对话。上文，昨天晚上，你的父亲回来得早吗？下文，当他到达家的时候，时间还不到8点。通过分析句子结构，可知这里包含一个时间状语从句，表示“当……时候”，故用when。