【題目】The little boy won't go to sleep ______ his mother tells him a story.
A.or
B.unless
C.but
D.whether

【答案】B
【解析】A. or或者，否則；B. unless除非……，如果……不……；C. but但是；D. whether是否；句意：這個小男孩不會去睡覺，除非他媽媽給他講一個故事。根據(jù)句意，故選B。

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