国家版权局1999年颁布的《出版文字作品报酬规定》中规定的稿酬主要支付方式有（）。

A.一次性付酬

B.基本稿酬＋印数稿酬

C.变动稿酬

D.版税

E.按合同约定的方式支付

Still many Senior Three students haven't realized reading English newspapers _______of great help to their English study.

A．is

B．are

C．have been

D．had heen