单项选择题
It took me a whole hour to
solve
the problem. ()
A work at
B. work on
C. work out
D. work over
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单项选择题
We have to think very carefully before we take any action, because it's a very serious situation we have encountered.
A.ideal
B.favourable
C.good
D.severe
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单项选择题
Gunpowder was used extensively in firearms prior to 1990.
A.in
B.around
C.from
D.before
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