______environmental damage is done，it takes many years for the ecosystem to recover.
#80690
A
Eyen if
B
If only
C
While
D
Once
推荐题目
Along with the letter was his promise he would visit me the New Year.
#30623
A
which
B
that
C
what
D
whether
．The theory is true _______ the hotter a body is, the more energy it gives off.
#34277
A
that
B
when
C
which
D
what
When I see you, the world stops ____ the only purpose in life was for me to please you．
#31057
A
even though
B
in case
C
as if
D
so that