(2013·高考四川卷)He is so busy.He cannot afford enough time with his son________he wants to.
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A
even if
B
as if
C
because
D
before
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I’ll finish the job ____ I come across great difficulty.
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A
however
B
even though
C
no matter
D
as though
_______ he lives in a rich family, he started from the lowest position as an ordinary worker to make his living.
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A
While
B
Unless
C
As
D
Since
_A container weighs more after air is put in, ____proves that air has weight.
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A
as
B
it
C
that
D
which
We should consider the students’ request _____ the school library provide more books on popular science．
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A
that
B
when
C
which
D
where