企业应该按照上年经营收入的（）作为安全管理费用，专项用于安全生产。

A.0.2%～0.5%

B.0.5%～1.0%

C.0.7%～1.0%

D.1.0%～1.5%

It is playing computer games       he spends so much time that he fails all the exams

A．which

B．what

C．in which

D．that