________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
________ the jewels were locked in a strong box，the thieves stole them without any difficulty.
#30445
A
If
B
Unless
C
Although
D
Because
English is understood all over the world_____ Turkish is spoken by only a few people outside Turkey itself.
#33415
A
while
B
when
C
as
D
since
Cathy had quit her job when her son was born _______ she could stay home and raise her family.
#29998
A
now that
B
as if
C
only if
D
so that