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【題目】Some hard working students always keep a torch in their dormitories _____ there is a power failure．

A． if B． unless

C． so that D． in case

【答案】D

【解析】A． if 如果B． unless 除非C． so that因此D． in case萬一。根據句意：一些學習刻苦的學生通常在宿舍備一個手電筒以防停電。選D。

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