国家赋予拟定外汇市场的管理办法，监督管理外汇市场的运作秩序，培育和发展外汇市场职责的金融监管机构是( )。

A．中国人民银行

B．中国银监会

C．中国证监会

D．国家外汇管理局

— Why did the dinner party start so late last night?

— It was _____ that caused him to serve dinner an hour later than usual. 

A．we were late

B．we being late

C．our being late

D．because we were late