-Could you tell me something about the boy who helped you just now?-- Sorry I know

问题补充：

---- Could you tell me something about the boy who helped you just now?

---- Sorry, I know nothing about him, we are .

A. friends

B. neighbors

C. classmates

D. strangers

答案：

A. friends

B. neighbors

C. classmates

(答案→)D. strangers

解析：根据题意可知我对他一无所知，那么我们应该是陌生人，stranger表示陌生人的意思，故本题选D。