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【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，我們未來將呼吸什么樣的空氣。根據主句的時態(tài)和時間狀語“in the future”可知，if條件句要用一般現在時表將來。根據句意可知選D。

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