You can only be sure of __________ you have at present; you cannot be sure of something __________ you might get in the future.

A．that; what

B．what; /

C．which; that

D．/; that

发包人收到竣工验收报告后( )内组织验收，并在验收后14大内给予认可或提出修改意见。

A．7天

B．14天

C．21天

D．28天