______the heavy pollution, the city officials have decided to cancel school for the day.

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问题 ______the heavy pollution, the city officials have decided to cancel school for the day.

选项 A、Prior
B、By means of
C、Due to
D、Through

答案C

解析 各选项的意思是:prior在前的,优先的;by means of依靠;due to由于,应归于;through从头到尾,彻底。根据句意可知,应选择C。
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