(2013·高考北京卷)Don’t turn off the computer before closing all programs，________you could have problems.
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A
or
B
and
C
but
D
so
推荐题目
You will succeed in the end ________ you give up halfway.
#32435
A
even if
B
as though
C
as long as
D
unless
The boys enjoy playing basketball __________ many of the girls relax by playing ping-pong.
#30719
A
while
B
or
C
since
D
if
Was it at the Olympic Games ______ were held this year ______ Liu Xiang got a metal?
#33790
A
which; that
B
which; which
C
that; when
D
when; that
Considering that she did her work ______ her manager had instructed, it was not proper to criticize her.
#31579
A
as
B
until
C
when
D
though
________ hard he tried, he could not change his wife’s mind.
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A
However
B
Whatever
C
As
D
No matter what