_______hard you try, it is difficult to lose weight without cutting down the amount you eat .

A．However

B．Whatever

C．Whichever

D．Whenever

项目的投资目标、进度目标与质量目标三者之间的关系是( )。

A．统一关系

B．互斥关系

C．互补关系

D．对立统一关系