题目内容

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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