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

A.unlessB.while
C.untilD.since

A

解析試題分析:句意:每一天,在我們學校的學生們將要做戶外活動除了這有很大的霧霾。分析選項:unless除非;while然而;until直到;since自從。結(jié)合原文描述,霧霾的天氣是不可能做戶外運動的,因此選擇除非。故選 A
考點:考查連詞的用法。

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