单选题：In the context of this passage, "secondhand smoke" may mean

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题目类型：单选题
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题目内容：

In the context of this passage, "secondhand smoke" may mean A．smoking bad-quality cigars.
B．smoking very cheap cigars.
C．being near cigar smokers when they are not smoking.
D．being near cigar smokers when they are smoking.

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