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    精英家教网 > 高中英语 > 题目详情
    The process of producing electricity may also give out CO2, ______ you heat your house with electricity instead of charcoal.
    A．as long asB．as soon asC．as ifD．even if
    D
    考查短语辨析。句意为：产生电的过程也会发出二氧化碳，即使你用电而不是用木炭加热你的屋子。故答案为D。
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