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    精英家教网 > 高中英语 > 题目详情
    As the experts tell us, we can pass on the flu _____ we realize we have it.

    A. before
    B. since
    C. while
    D. when
    A
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    科目：高中英语 来源：河南省模拟题 题型：单选题

    As the experts tell us, we can pass on the flu _____ we realize we have it.
    [     ]
    A. before
    B. since
    C. while
    D. when

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