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______ he has said sorry to you, please give him another chance. A.When B.Since C.Before D.Until
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Bell i________ (发明) the telephone.
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____________,月照花林皆似霰。空里流霜不觉飞,____________。(《春江花月夜》)
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There were 247 ________ (投票) in favour of the plan and 152 against.
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已知公差不为0的等差数列{an}满足a1,a3,a4成等比关系,Sn为{an}的前n项和
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