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Every day students in our school will do outdoor activities ______ there is a heavy haze(雾霾).

A.unlessB.while
C.untilD.since

A

解析试题分析:句意:每一天,在我们学校的学生们将要做户外活动除了这有很大的雾霾。分析选项:unless除非;while然而;until直到;since自从。结合原文描述,雾霾的天气是不可能做户外运动的,因此选择除非。故选 A
考点:考查连词的用法。

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