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He will spend six hours at his desk _______ he finishes his composition.
A.beforeB.untilC.afterD.when
A
考查时间状语从句的连接词。句意“在完成作文之前,他将花6个小时的时间坐在椅子上。”until常与not连用;before“在......之前”。故选A。
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