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    Vitamin D gets produced when animals are exposed to direct sunlight, for＿reason, it
    is always advisable to give them chances to spend time in the sun.

    A．whoseB．that 　
    C．whichD．its

    C

    解析试题分析：考查定语从句。句意：当动物直接接触阳光时维生素D 就会产生，因为这个原因，给他们适合的时间去晒太阳是非常明智的。Which代指上面这个原因，故选C项。
    考点 : 考查定语从句

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