______ environmental damage is done, it takes many years for the ecosystem to recover.
#73217
A
Even if
B
If only
C
While
D
Once
推荐题目
Many experts stick to the view teacher development is the key to quality education lies.
#68873
A
which; where
B
which; in which
C
that; where
D
that; in which
Anything _____ could be found has been used to repair the damaged bridge.
#69440
A
which
B
that
C
what
D
不填
Why are you always making the same mistake? Think of _____ I told you.
#73285
A
that
B
when
C
how
D
what
My boss left word with my assistance______he would hold a meeting at six in the evening for personnel matters.
#73652
A
who
B
as
C
which
D
that