________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
I’ve got a lot of books, ________ are written in foreign languages.
#34527
A
and most of which
B
some of which
C
some of them
D
most of these
— How long will it be _______ the president pays another visit to China?— It all depends.
#32222
A
before
B
until
C
since
D
when
Our class adviser doesn’t doubt，in any case.___.we can overcome the difficulties in our study.Healways gives us a confident smile.
#30632
A
how
B
whether
C
that
D
why
_________ he took plane, he was frightened to cry.
#31031
A
First time
B
At the first time
C
For the first
D
The first time