Whatever is left over may be put into the refrigerator，________ it will keep for two or three weeks.(2011·安徽)
#30498
A
when
B
which
C
where
D
while
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It is not immediately clear__________ the financial crisis will soon be over.
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since
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Most birds find it safe to sleep in the trees, but ______ they have eggs or young chicks, they don’t use a nest.
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why
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#80630
A
either
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though
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