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【題目】The exhibition tells us we should do something to stop air pollution.
A.where
B.why
C.what
D.which

【答案】B
【解析】句意：這個展覽告訴了我們，我們為什么要停止空氣污染而不是我們在哪兒停止空氣污染。賓語從句中不缺少主語和賓語，因此選關系副詞，根據句意，選擇B。

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