【題目】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
【解析】happen用主動(dòng)表被動(dòng)。根據(jù)句意應(yīng)用現(xiàn)在完成時(shí)，故選B。

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