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:
A. to be sent
B. to send
C. being sent
D. sending
解析:此处be supposed to do sth.意为“被期望做某事;应该做某事”,不定式做宾语。表示“消息被传送”,应该用不定式的被动式。下列动词常跟不定式做宾语:want,wish,hope,expect,ask,demand,pretend,care,decide,happen,offer,refuse,fail,plan,prepare,order,cause,afford,beg,manage,agree,promise等。