--Look!Whyaretheresomanypeople?--Therearesomepolicemen....
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问题详情:
--Look! Why are there so many people?
--There are some policemen. I think there ________ a traffic accident.
A. must have B. can have C. is going to be D. must be
【回答】
D
知识点:情态动词
题型:选择题
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