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【题目】I wonder ________ as the ads has promised.

A. does the air-cleaner really work B. the air -cleaner really works

C. that the air-cleaner really works D. if the air-cleaner really works

【答案】D

【解析】句意:我想知道是否空气过滤器真的工作起来像广告承诺的那样。这里考查是宾语从句,宾语从句的语序是陈述语序,故排除A;根据空格前有wonder可知,宾语从句的引导词用if,不能用that。故选D。

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