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A
did they realize
B
have they realized
C
they did realize
D
they have realized
正确答案 :B
解析
【翻译】我们一再强调戒烟的重要性,但他们几乎意识不到。 [考点]倒装句型 【精析】B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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