问题
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【B16】A.to having foundB.to have been foundC.to have foundD.to find
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The past few years have given way to a heated debate about whether downloading free online
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【C7】A.has beenB.have beenC.had beenD.to have been
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It is earths heat______ scientists have developed a sensitive instrument to measure.A.whoB
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A: Have you been to Canada before? B:().
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A number of theories have been proposed to