Every day students in our school will do...

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。

考点分析：

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