问题
选择题
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
：D
：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。