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    【题目】 __________ you are grown up, you must stop this childish behavior, or you'll make a fool of yourself.

    A. Now that

    B. Until

    C. Although

    D. Even if

    【答案】A

    【解析】now that引导原因状语从句，意为“既然”。句意为“既然你已经长大了，就必须停止这样幼稚的行为，否则你会出丑的”。

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