——There's a police car in front of our neighbor's house.——() do you suppose has happened?A.Why B.When C.What D.It
问题描述：
——There's a police car in front of our neighbor's house.——() do you suppose has happened?
A.Why B.When C.What D.It
答
what代词作主语。do you suppose 是插入语，构成复合问句。has happened是谓语。A.Why 和B.When都不作主语，它们是副词。最后.It是人称代词，不引导任何从句。希望你明白。
答
C
我们邻居家门口停了辆警车。
你觉得是发生了 （什么）？
答
选What
简单句为what has happened?即,发生了什么?
do you suppose作为插入语,意为"你认为“,全句：你认为发生了什么?