I was walking along the street and all of a sudden a car cut in and knocked me down-

问题补充：

--- I was walking along the street and all of a sudden, a car cut in and knocked me down．

--- You can never be in the street．

A. careful enough

B. much careful

C. very carefully

D. too carefully

答案：

(答案→)A. careful enough

B. much careful

C. very carefully

D. too carefully

解析：cannot/never … enough ... 意思是：再...也不为过; You can never be careful in the street意思为：你在街上再小心都不为过。而其他选项不符合整段话的语境。