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

D

【解析】A. if 如果B. unless 除非C. so that因此D. in case萬(wàn)一。根據(jù)句意：一些學(xué)習(xí)刻苦的學(xué)生通常在宿舍備一個(gè)手電筒以防停電。選D。

考點(diǎn)：考查狀語(yǔ)從句。

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