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。