【題目】I wonder ________as the advertisement has promised．

A.does the air﹣cleaner really workB.the air﹣cleaner really works

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

【答案】D

【解析】

句意：我想知道空氣清潔器是否真的如廣告所承諾的那樣工作。

根據(jù)I wonder 可知，本題考查賓語從句，賓語從句用陳述語序，選項A是疑問語序，所以排除掉；that引導賓語從句無實意，可省略，whether或if引導賓語從句，意思是"是否"，根據(jù)語境"我想知道空氣凈化器是否真的像廣告所承諾的那樣工作"可知，要用whether或if引導，排除B/C。故選D。

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