He will spend six hours at his desk _______ he finishes his composition.
A．beforeB．untilC．a(chǎn)fterD．when
A
考查時間狀語從句的連接詞。句意“在完成作文之前，他將花6個小時的時間坐在椅子上。”until常與not連用；before“在......之前”。故選A。
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