问题
选择题
He will spend six hours at his desk _______ he finishes his composition.
A．before
B．until
C．after
D．when
答案
答案：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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