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    【题目】In the experiments, the scientists found that water __________ at 100℃.

    A. boils B. boil

    C. has boiled D. had boiled

    【答案】A

    【解析】句意：在实验中,科学家发现了水在100度沸腾。水在100度沸腾,这是客观真理,故用一般现在时

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