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If____________ , the polluted air can result in deadly diseases or even death.
A.being breathed inB.having been breathed in
C.breathed inD.breathing in

答案
C
解析

核心考点
试题【If____________ , the polluted air can result in deadly diseases or even death.A.】;主要考察你对现在分词等知识点的理解。[详细]
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