【题目】I can’t imagine what air we would be breathing in if we __________ anything to stop air pollution.
A. hadn’t done B. didn’t do
C. haven’t done D. don’t do
在线课程【答案】B
【解析】试题分析：根据语境“我无法想象如果我们不采取措施阻止空气污染，我们将呼吸什么样的空气”可知该处是对将来情况的虚拟，if条件句要用一般过去时，故选B。
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