问题
选择题
There is a police car in front of our neighbor's house. What do you suppose ______?[ ]
A. did happen
B. has happened
C. is happen
D. has been happened
答案
答案：B
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There is a police car in front of our neighbor's house. What do you suppose ______?[ ]
A. did happen
B. has happened
C. is happen
D. has been happened
答案：B