Wood furniture does not depreciate in value______.

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问题 Wood furniture does not depreciate in value______.

选项 A、if they are handle properly and protected properly
B、unless handling and protecting properly
C、if properly handled and protected
D、unless for all its handling and protection

答案C

解析 if意为“如果”,而unless意为“除非”,相当于if…not。根据旬意可知,应选择if引导的条件状语从句。当if引导的从句与主句的主语相同时,可以用“if+分词”结构。
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