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    【题目】_______ scientists have learned a lot about the world, there is much we still don't know.

    A.IfB.ThoughC.SinceD.Unless

    【答案】B

    【解析】

    句意：虽然科学家们对这个世界了解很多，但还有很多我们还不知道。

    考查连词辨析。If如果；Though 尽管；Since自从； Unless除非，如果不。根据“there is much we still don't know.”可知，此处是Though引导的让步状语从句。根据题意，故选B。

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