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

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：考察固定结构和语态。Be supposed to do sth应该做某事；根据句意可知使用被动语态。句意：那个消息非常重要，所以它应该尽快被发送。