---Bad luck! I the sidewalk when an Audi cut in and knocked me down.---You can never be t

问题补充：

---Bad luck! I the sidewalk when an Audi cut in and knocked me down.

---You can never be too careful!

A. crossed

B. have crossed

C. was crossing

D. had been crossing

答案：

A. crossed

B. have crossed

(答案→)C. was crossing

D. had been crossing

解析：句意：--这倒霉！我在过人行道时突然一辆奥迪插过来把我撞到了。--你越小心越好。这是be doing …when….这在做某事突然发生了某事。根据knocked，所以用过去进行时，故选C。