Doing your homework is a sure way to improve your test scores, and this is especially true ____ it comes

to classroom tests. [ ]

A. before

B. since

C. when

D. after

（）可列席集中采购委员会会议，对审议事项进行必要的说明，但不具投票表决权。

A.需求部门

B.财务部门

C.法律部门

D.监察部门