We all hold such a view that  ________good knowledge of English is what is needed badly

in ________international trade today.[      ]

A. a; /  

B. the; the

C. the; an  

D. /; the

在实务中。如果优先股有固定股利而无到期日，因此优先股股利可视为()。

A.后付年金

B.先付年金

C.递延年金

D.永续年金