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People love the  convenience of bottled water, but if they ________ the problem it causes, they ________ try carrying water in a reusable steel container instead of plastic.
A.realized; willB.had realized; will
C.realized; wouldD.have realized; would
C
C 考察虚拟语气。句义:人们喜欢瓶装水的便利,但如果他们意识到瓶装水会导致的问题,他们就会使用可循环的铁罐代替塑料瓶来装水。If虚拟句表示对现在的虚拟假设。故C正确。
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