______ for the free tickets, I would not have gone to the films so often.

A．If it is not

B．Were it not

C．Had it not been

D．If they were not

布洛芬的有关物质检查采用（）.

A．薄层色谱法

B．高效液相色谱法

C．紫外分光光度法

D．气相色谱法

E．酸碱滴定法