—Did Jack come back early last night?—Yes it was not yet eight o’clockhe arrived home.A. w

问题补充：

—Did Jack come back early last night?

—Yes,it was not yet eight o’clockhe arrived home.

A. why

B. when

C. that

D. which

答案：

A. why

(答案→)B. when

C. that

D. which

解析：考查状语从句。这是一个时间句型：it is/was+具体的时间+when引导的从句，表示当……的时候，是……时候。