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    1．When crossing the street，we _________ never be too careful．（　　）
    A．mayB．shouldC．canD．must

    分析 当穿过街道的时候，我们多么小心也不为过．

    解答 答案：C．can的否定式和too或enough 连用表示"多么…也不为过"，其他情态动词没有这种用法．

    点评 考查情态动词．can构成下列特殊句式：
    ①can not/can never…too…或cannot…enough"无论怎么…也不过分；越…越好；非常…"．
    One cannot be too careful．越认真越好．
    I cannot thank you enough．我对你感激不尽．
    ②cannot help doing…/cannot help but do…/cannnot but do…"禁不住；不由得；不得不"．
    I cannot help admiring the picture whenever I look at it．
    When a close friend dies，you cannot but feel sad．

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