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- 2It looks ___it is going to rain.A as if B like C as D that
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- 4How much is this coat ?的同义句 How much ___this coat ___?
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- 9设等差数列{an}的前n项的和为Sn,公比是正数的等比数列{bn}的前n项的和为Tn,已知a1=1 b1=3,a3+b3=17
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