There are so many people over there.What ________?Maybe there's a traffic accident.选B 其他三个不
问题描述：
There are so many people over there.What ________?Maybe there's a traffic accident.选B 其他三个不
能选的理由 是什么 A.happens B.is happening C.is happened D.was happened
答
There are so many people over there.What ________? Maybe there's a traffic accident.
根据语境选B,前\后面句都是现在时,后句更是推测,所以现在正发生什么事是推测的内容.
C.D 被动语态不可能这样用的 A是一般现在时也不能用在happen