1. a: where's Janet? upstairs?

   b: __________ tired, she went to bed earlier than usual.

 

a) having been feeling

b) having felt

c)being felt

d) feeling

답이 왜 d가 되는지 모르겠어요 b는 안되나요?

 

2. Have you ever heard abour a terrible disease ________ is still unknown?

a) which the cause of

b) which of the cause

c) of the cause which

d) of which the cause

 

답이 왜 d가 되는지 모르겠습니다