.

— When did they come back last night?

— It was midnight ____ all of us were sleeping.

A．that

B．when

C．which

D．in which

以下会导致招标人承担民事责任的是( )。

A．招标人在招标文件中明确规定对投标人的资格要求
B．某依法必须招标项目，招标人为了节省资金，就提前与投标人就投标价格进行谈判
C．某招标项目设有标底，招标人告知所有投标人“标底保密”
D．招标人与中标人根据招标文件和投标文件签订书面合同