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  3. We mention the importance of giving up smoking once and again, but hardly______it.

We mention the importance of giving up smoking once and again, but hardly______it.

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问题 We mention the importance of giving up smoking once and again, but hardly______it.
选项 A、did they realize
B、have they realized
C、they did realize
D、they have realized
答案B
解析 表示否定意义的词或短语位于句首时，句子要用倒装，可先排除C、D 项。根据句意可知，此处应用现在完成时，表示之前的动作对现在发生事情的影响。 所以选B。
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