(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

根据物权法理论，______属于用益物权。

A．国有企业经营权

B．采矿权

C．典权

D．集体所有土地承包权