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    【题目】Scientists ______ thousands of chemicals before they decided on the right one in the end.

    A. tried out

    B. found out

    C. worked out

    D. turned out

    【答案】A

    【解析】try out尝试、试验；find out调查；work out计算、算出、锻炼；turn out证明是、原来是。

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