Question

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

A．whether　　

B．although

C．for　　　　

D．so

Answer 1

B解析：句意：尽管我费了好大劲才将他叫醒，但弗兰克坚持说他没有睡熟。although虽然；尽管；whether是否；for因为；so因此。根据句意选B项。