I Mr White at that time otherwise I wouldn’t have asked you for some information about h

问题补充：

I Mr White at that time, otherwise I wouldn’t have asked you for some information about him.

A. hadn’t known

B. didn’t know

C. don’t know

D. haven’t known

答案：

A. hadn’t known

(答案→)B. didn’t know

C. don’t know

D. haven’t known

解析：考查时态。根据句意：否则我就不会问你关于他的那么多的信息，可知我过去不认识怀特先生，故用一般过去时，选B。