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【题目】I wonder ________as the advertisement has promised

A.does the aircleaner really workB.the aircleaner really works

C.that the aircleaner really worksD.if the aircleaner really works

【答案】D

【解析】

句意:我想知道空气清洁器是否真的如广告所承诺的那样工作。

根据I wonder 可知,本题考查宾语从句,宾语从句用陈述语序,选项A是疑问语序,所以排除掉;that引导宾语从句无实意,可省略,whetherif引导宾语从句,意思是"是否",根据语境"我想知道空气净化器是否真的像广告所承诺的那样工作"可知,要用whetherif引导,排除B/C。故选D

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