There are so many people over there.What ________?Maybe there's a traffic accident.A.happensB.is happeningC.is happenedD.was happened

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There are so many people over there.What ________?Maybe there's a traffic accident.A.happensB.is happeningC.is happenedD.was happened
There are so many people over there.What ________?Maybe there's a traffic accident.
A.happens
B.is happening
C.is happened
D.was happened

There are so many people over there.What ________?Maybe there's a traffic accident.A.happensB.is happeningC.is happenedD.was happened
B

B.is happening 正在发生的事情 (前面用了are)

选B 根据语态可以看出