The earth became so violent that it was not clear_________ the shape would last or not.
#32770
A
if
B
how
C
whether
D
why
推荐题目
(2010·上海)Wind power is an ancient source of energy ________ we may return in the near future.
#30491
A
on which
B
by which
C
to which
D
from which
“Drive-ins” have large parking lots ______ customers are served in their cars by waitresses.
#32599
A
who
B
when
C
which
D
where
Many of them turned a deaf ear to his advice，________ they knew it to be valuable.
#30687
A
as if
B
now that
C
even though
D
so that
Yao Ming made it clear that he would never consider retiring from the NBA he could recover his health.
#33368
A
as long as
B
as far as
C
as well as
D
as soon as