根据主承销商的书面委托,( )向符合条件的询价对象提供申购平台进行初步询价及累计投标询价。
A.证券公司
B.证券代理人
C.证券交易所
D.证监会
参考答案:C
When did you buy these new CDs?
I them for two days.
A. had B. have bought C. have had
井控应急工作应坚持的原则是什么?