Some scientists believe that is no doubt a cure for AIDS will be found.
#93048
A
it; that
B
it; whether
C
there; that
D
there; whether
推荐题目
The drunk driver is ___ for the traffic jam yesterday.
#94669
A
to blame; occurred
B
to blame; occurring
C
to be blamed; occurred
D
to be blamed; occurring
It never _____ humans until the mid1990s that some animals can be cloned.
#92718
A
occur
B
is occurred
C
occurred to
D
occurred
I’m not a little tired today after giving the room a thorough cleaning and I have never had_________today.
#93480
A
as tiring a day as
B
as a tiring day
C
tiring as a day as
D
day as tiring as
Since time began, it seems, people have been putting off______they______have done today, scolding themselves in the meantime．
#93038
A
that, must
B
that, should
C
what, could
D
what, would
our earth, or else it will be no longer fit for us to live on.
#92853
A
Protect
B
To protect
C
Protecting
D
Protected