——Did Jack come back early last night?——Yes. It was not yet eight o’clock he arrived home

问题补充：

——Did Jack 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：句意：--杰克昨晚回来早吗？---是的，当他回来时 时间还不到八点。这里用when引导时间状语从句，it指时间，注意这句话不是强调句型 如果是强调句型时间前应加介词at（It wasat 8 o’clock that he arrived）故C 错。如果用before必须是时间段 如 It was eight hours before he arrived八小时后他到了。也不是not until句型 该句型一般强调主语的动作 如He didn arrive until eight! 他直到八点才到！选B。