【題目】We have no idea what air we will be breathing in the future if we anything to stop hazy weather.

A. hadn’t done B. didn’t do

C. haven’t done D. don’t do

【答案】D

【解析】考查時(shí)態(tài)。句意為：我們不知道如果我們不采取措施阻止霧霾天氣的話，我們未來(lái)將呼吸什么樣的空氣。根據(jù)主句的時(shí)態(tài)和時(shí)間狀語(yǔ)“in the future”可知，if條件句要用一般現(xiàn)在時(shí)表將來(lái)。根據(jù)句意可知選D。

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