______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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