I didn't know _____ they could pass the exam or not. [ ]

A. why

B. when

C. that

D. whether

运输中国烟草总公司直属专业公司进口的烟用丝束，烟草专卖品准运证（）签发。

A.应当由国家烟草专卖局

B.省级烟草专卖局可以

C.由国家烟草专卖局授权的机构

D.由省级以上烟草专卖局