Some scientists have questioned the theory ______ CO2 is causing dangerous global warming.
#68429
A
which
B
what
C
that
D
why
推荐题目
It was already lunchtime, so we sat down there was a nice garden and ate something.
#68237
A
before
B
unless
C
that
D
where
We should do more such exercises in the future, I think, ____ we did yesterday.
#73082
A
as
B
which
C
that
D
than
We’ll have to finish the job, _________.
#69693
A
long it takes however
B
it takes however long
C
long however it takes
D
however long it takes