问题补充:
There is a police car in front of the house of our neighbours. do you think ?
A. What;has happened
B. What;of happening
C. What;of being happened
D. Whatever;of happening
答案:
(答案→)A. What;has happened
B. What;of happening
C. What;of being happened
D. Whatever;of happening
解析:do you think可理解为插入语.