The message is very important so it is supposed as soon as possible . A. sendingB. to s

问题补充：

The message is very important , so it is supposed as soon as possible .

A. sending

B. to send

C. being sent

D. to be sent

答案：

A. sending

B. to send

C. being sent

(答案→)D. to be sent

解析：：考查固定结构和语态。Be supposed to do sth应该做某事；根据句意是被动语态。句意：这个信息非常重要，所以应该立刻被送出去。故D正确。