There are so many people over there.What ________?Maybe there's a traffic accident.A.happensB.is happeningC.is happenedD.was happened
问题描述：
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
答
选B 根据语态可以看出
答
B.is happening 正在发生的事情 (前面用了are)
答
B