问题：
(2013·安徽合肥三校一模)—Was it at 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
(2013·安徽合肥三校一模)—Was it at 11 o"clock ________ your father came back last night?
—Yes, he is always coming back so late.
—Yes, he is always coming back so late.
| A．that | B．while |
| C．when | D．until |
参考答案：