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：考查词组：be supposed to do应当做…,因为the message和send是被动关系，所以是不定式的被动，句意：这个信息很重要，应该尽快被送出去。选A。