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

分析 在全軍準備就緒之前，還將有一些額外的事須處理．

解答 答案C．
A選項until意為"直到…才"；B選項since意為"自從…以來"；C選項before意為"在…之前"；D選項unless意為"除非，如果不"，引導條件狀語從句，故排除．A、B、C三個選項都引導時間狀語從句，但是根據常識可知"還將有一些額外的事須處理"應該在"全軍準備就緒"之前，故選C．

點評 本題考查從屬連詞辨析．根據選項中連詞的意義，并結合句意，選擇合適的連詞．

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