life will continue on the earth for millions of years to come will depend on the problem of pollution can be solved.
#30117
A
How /whether
B
That/that
C
Whether / if
D
Whether / whether
推荐题目
He has been in bed ______ he fell off his bike a week ago.
#30656
A
even if
B
soon after
C
now that
D
ever since
The school ______Elias studied for only two years was three miles away.
#32965
A
where
B
that
C
on which
D
which
4 You will succeed in the end ____ you give up halfway.
#80147
A
even if
B
as though
C
as long as
D
unless
_____ you keep on trying, I really don’t mind whether you can come up top in your class.
#31232
A
As long as
B
Even though
C
As soon as
D
The moment