问题
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There is always the ____of an earthquake in this region, but so far there has been no sign
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There are ______ major periods in the drama of the West.A.FourB.FiveC.SixD.Three
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There are ten stories in this book,______are the most interesting ones.A.the first four of
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The argument remained heated ______ there are necessary conditions of existence such a
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There are signs______the worst of the recession may be over.A.whichB.thatC.whyD.what
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There are strict rules_____the use of chemicals in food
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