3．They continued to climb ______ they reached the top of the mountain．（　�。�
A．untilB．beforeC．whenD．as

分析 他們繼續(xù)爬山直到爬到山頂．

解答 答案：A．
until用于肯定句中，表示主句的動作一直持續(xù)到從句動作發(fā)生或狀態(tài)出現(xiàn)時為止．一般可譯為"…直到…為止"．故選A．

點評 對于連詞的題目考查要分清句子前后之間的邏輯關(guān)系，并注意積累一些常用的短語，關(guān)聯(lián)詞等，便于題目的解答．

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