________you never plan to visit the polar bears in the North Pole or the penguins in the South Pole，now it is the proper time to start thinking about that.
#30102
A
Until
B
Unless
C
As long as
D
Even if
推荐题目
Hurry up ___ we ___ miss the train.
#31681
A
and, are about to
B
or, are about to
C
or, will
D
and, shall
You’ll find it hard to get rid of the drug habit you have it.
#33852
A
before
B
once
C
until
D
though
We _____ walk in the moonlight, taking about _____ we were interested in.
#33942
A
used to, all what
B
were used to, all what
C
used to, all that
D
were used to, what
_______ you think graffiti (涂鸦) is mindless vandalism(破坏行为) against property or a living art form, its popularity suggests that it is here to stay.
#33373
A
Although
B
No matter
C
Whether
D
Suppose
_____I saw the West Lake, I was struck by its beauty.
#79690
A
The first time
B
For some time
C
For the first time
D
At the first time