{01}____ this may sound like a simple process, great care is needed. A.Since B.Once C.Although D.Unless 解析: 本题选C。 {02}He will spend six hours at his desk ______ he finishes his composition. A.before B.until C.after D.when 解析: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。 本题选A。
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