问题补充:
The message is very important, so it is supposed as soon as possible.
A. to be sent
B. to send
C. being sent
D. sending
答案:
(答案→)A. to be sent
B. to send
C. being sent
D. sending
解析:考查固定结构和语态。固定结构be supposed to do sth应该做某事;句意:那个消息很重要,所以它应该被尽早送出去。根据句意说明使用被动语态,故A正确。