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题库 / Prep2008E1-SC-243
Sulfur dioxide, a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system's ability to deal with all other pollutants.
an especially serious pollutant because it diminishes the respiratory system's ability to deal
an especially serious pollutant because of diminishing the respiratory system's capability of dealing
an especially serious pollutant because it diminishes the capability of the respiratory system in dealing
a specially serious pollutant because it diminishes the capability of the respiratory system to deal
a specially serious pollutant because of diminishing the respiratory system's ability to deal
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选项B的because of doing 本身没问题，但是这句话说完了，diminishing的发动者是谁，很不清晰，所以不靠谱
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