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

分析 當(dāng)穿過街道的時候，我們多么小心也不為過．

解答 答案：C．can的否定式和too或enough 連用表示"多么…也不為過"，其他情態(tài)動詞沒有這種用法．

點評 考查情態(tài)動詞．can構(gòu)成下列特殊句式：
①can not/can never…too…或cannot…enough"無論怎么…也不過分；越…越好；非常…"．
One cannot be too careful．越認(rèn)真越好．
I cannot thank you enough．我對你感激不盡．
②cannot help doing…/cannot help but do…/cannnot but do…"禁不�。徊挥傻�；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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