普通股票股东是否具有优先认股权，取决于( )。

A．认购时间与股权登记日的关系

B．认购时间

C．股权登记日

D．持有股票时间的长短

On some British streets, there ________ be as many as five different garbage cans-that's confusing![ ]

A. can  

B. have to

C. must  

D. shall