(2013·四川省乐山一模)The pupils were playing games in the classroom ________ a gunman entered and began shooting wildly at them.
#30425
A
while
B
when
C
as
D
before
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_______ a small number of Australians are bitten by spiders each year, most recover without any medical treatment.
#31526
A
While
B
Unless
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When
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Because
It is difficult for us to learn a lesson in life ______ we’ve actually had that lesson.
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until
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as
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that
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We should consider the students’ request _____ the school library provide more books on popular science．
#34411
A
that
B
when
C
which
D
where