--- It’s the fourth time that heavy smog(霧霾) has hit the city this month.
--- It’s high time we _______ measures to fight air pollution.
A．will takeB．tookC．to take D．taking
B

試題分析:考查動(dòng)詞時(shí)態(tài)。“It is high time +that 從句”是固定句型“到了做某事的時(shí)間了”從句中用一般過(guò)去時(shí)或者should +動(dòng)詞原形；所以B選項(xiàng)正確。句意：--這是霧霾天氣在這個(gè)月中第四次侵?jǐn)_這座城市了。--到了我們采取措施消滅空氣污染的時(shí)候了。
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