题目

选择题39）An ambulance and some police cars were waiting in front of the house,with doctors running
An ambulance and some police cars were waiting in front of the house,with doctors running in and out and some polimen standing nearby.Somebody ________ injured or killed.
A.must have been
B.should have been
C.must been
D.would have been
C是must be

提问时间：2020-08-04

答案

答案是A.情态动词+have +done,表示的是对过去的动作进行推测或虚拟.must have been
表示对过去的动作的肯定的推测,“（过去）肯定做过某事”.