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
网友回答
(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。