—Was it 11 o'clock your father came back last night?—Yes he is always coming back so lat

问题补充：

—Was it 11 oclock your father came back last night?

—Yes, he is always coming back so late.

A. that

B. while

C. when

D. until

答案：

A. that

B. while

(答案→)C. when

D. until

解析：C 考察状语从句。本句中的it代表世界，故使用表示时间的连词when引导时间状语从句，故C正确。