Some researchers believe that there is no doubt______a cure for AIDS will be found.
#67655
A
whether
B
that
C
what
D
which
推荐题目
We’ll go hiking if it_________ rain tomorrow.
#41325
A
won’t rain
B
isn’t going to rain
C
doestn’t rain
D
don’t rain
We don't know ___ to pay a visit to the old town.
#73538
A
whether
B
if
C
that
D
which