题目内容

17．There would be additional work to be done _____ all the troops were ready．（　　）
A．untilB．sinceC．beforeD．unless

分析 在全军准备就绪之前，还将有一些额外的事须处理．

解答 答案C．
A选项until意为"直到…才"；B选项since意为"自从…以来"；C选项before意为"在…之前"；D选项unless意为"除非，如果不"，引导条件状语从句，故排除．A、B、C三个选项都引导时间状语从句，但是根据常识可知"还将有一些额外的事须处理"应该在"全军准备就绪"之前，故选C．

点评 本题考查从属连词辨析．根据选项中连词的意义，并结合句意，选择合适的连词．

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