---- Was it by cutting down staff ____ are not diligent eough  _    _she saved the firm?

----- No, it was by improving work efficiency.

A．that;when

B．that;what

C．who;how

D．who ;tha

招标方式中，邀请招标与公开招标比较，其缺点主要有( )等。

A．选择面窄，排斥了某些有竞争实力的潜在投标人

B．竞争的激烈程度相对较差

C．招标时间长

D．评标工作量较大

E．招标费用高