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    After designing more experiments,they were able to clarify the procedure　　  bees communicate information that they use to find and fetch food.

    A.by which　　　　　　　　　B.in which

    C.by that　　　　　　　　　　D.for which

    A


    解析:

    by which是介词+which构成的定语从句，表方式。

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