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    (   ) 5. Tom is very good at science_______ his brother Jimmy knows nothing about it.

    A. if B. when

    C. while D. because

    C此处while用作连词表示对比，意为"然而"。

    题目来源：仁爱英语同步练习册九年级上册仁爱版 > Topic2 All these problems are wery serious.

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