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13．你知道他們到現在為止結婚多久了嗎？
Do you know how longthey have been married up to now？

分析 they have been married up to now

解答答案：they have been married up to now．
短語"到現在為止"的英文表達是：up to now，結合設空處前面的how long判斷所填寫的賓語從句部分用現在完成時（have/has+動詞的過去分詞），且用陳述語序，此處的"結婚"用短語be married，故答案為：they have been married up to now？

點評做這類題型，首先根據所給漢語明確句子所要考查的單詞或短語的拼寫，再結合相關語法知識對單詞或短語做出形式上的變化．

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