_____ the police thought he was the most likely one, since they had no exact proof about it,they had to set him free.

A．As long as

B．If only

C．Although

D．As though

下列说法不正确的是（）。

A．质量是一组固有特性满足要求的程度

B．质量有固有的特性也有赋予的特性，两者之间是不可转化的

C．质量具有经济性，广义性，时效性，和相对性

D．质量管理是兴国之道，治国之策。