Question

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

A．that	B．while
C．when	D．until

Answer 1

C

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。