Frank insisted that he was not asleep I had great difficulty in waking him up.A. whetherB.

问题补充：

Frank insisted that he was not asleep I had great difficulty in waking him up.

A. whether

B. although

C. for

D. so

答案：

A. whether

(答案→)B. although

C. for

D. so

解析：本题考查连词。句意为：“虽然我很费劲地才叫醒Frank，他却坚持说他没睡着。”，故此处应为连词although引导的让步状语从句。故正确答案为B。