题目内容：

While crossing the street,____________.
A.an accident happened to her
B.she happened an accident
C.she had an accident
D.she has an accident

优质解答

c.
因为开始用的是while ,所以主句应为人,所以排除a.
应该是她遭遇了车祸而不是发生了车祸,同时应该是过去发生的事情,所以选C