Themessageisveryimportant,soitissupposed

來源：國語幫 1.66W

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

A 解析be supposed to do是固定搭配。又因it（the message）與send因為被動關係，故用動詞不定式的被動語態。