_______environmental damage is done, it takes many years for the ecosystem to recover.
#31390
A
Even if
B
If only
C
While
D
Once
推荐题目
A curve is a line ______ no part is straight and which has no angle.
#30518
A
that
B
whose
C
in which
D
of which
Many people claim that they have seen UFO with their own eyes, _____ I personally doubt.
#34387
A
that
B
which
C
when
D
where
______ I admit that there are problems, I don't agree that they cannot be solved.
#30120
A
As
B
If
C
While
D
When
Today the world is paying much more attention to,obviously, China says and does.
#33337
A
that
B
which
C
what
D
how
________ a child begins school, he enters a world of vicious competition where success and failure are clearly defined and measured.
#33375
A
Before
B
Until
C
Whenever
D
The moment