The message is very important so it is supposed as soon as possible.A. to be sentB. to

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。