It is pretty well understood __________controls the flow of carbon dioxide in and out the atmosphere today.
#74032
A
that
B
when
C
what
D
how
推荐题目
Today’s teens don’t see anything strange in the fact _______the computer takes up a central place in their social lives.
#68493
A
which
B
that
C
where
D
what
I would appreciate it ________ you call back this afternoon for the doctor's appointment.
#67449
A
until
B
if
C
when
D
that
The judge paid no attention to _____ he had just lost his wife.
#74241
A
that
B
which
C
what
D
the fact that