-Did Tom come back late last night?---No. It was not yet 8 o’clock he arrived home.A.

问题补充：

---Did Tom come back late last night?

---No. It was not yet 8 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：--汤姆昨天晚上回来地晚吗?—没有，他到家的时候还不到8点。这里when引导的定语从句，先行词是8 o’clock，when在定语从句中作状语，其他的连词before 和until不能引导定语从句，that在定语从句中不能做状语，故选B。