【題目】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:我想知道是否空氣過濾器真的工作起來(lái)像廣告承諾的那樣。這里考查是賓語(yǔ)從句,賓語(yǔ)從句的語(yǔ)序是陳述語(yǔ)序,故排除A;根據(jù)空格前有wonder可知,賓語(yǔ)從句的引導(dǎo)詞用if,不能用that。故選D。

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