I was ________ of crossing the road ________ the car accident happened．

1. A.
   around the time; when
2. B.
   on the point; that
3. C.
   at the moment; when
4. D.
   on the point; when

I was ________ of crossing the road _______ the car accident happened.（ ）

A. around the time; when　　　　　　　 B. on the point; that

C. at the moment; when　　　　　　　　 D. on the point; when