Some researchers believe that there is no doubt___ a cure for AIDS will be found.
#74636
A
which
B
that
C
what
D
whether
推荐题目
The factory was built in a secret place, around ______ high mountains. 
#73353
A
which was
B
it was
C
which were
D
them were
____ is none of your business.  
#70207
A
What action I shall take      
B
What action shall I take  
C
It is what action I shall take     
D
I shall take what action