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12．---How long did you wait？
---__________ they came back at 10．（　　）
A．UntilB．BeforeC．AfterD．When

分析 -你等了多久？
-一直等到他們十點回來．

解答 答案：A
題干中how long是對時間段提問；until直到，before之前，after之后，when當…時候；句意表達的是動作的持續，until后接時間狀語，前面省略了I waited，即I waited until they came back at 10；表示持續動作的持續時間，要用until來連接．故選A．

點評 從屬連詞是連詞的一種，用來引導名詞性從句和狀語從句．大致可分為三大類：that（無詞義，不做成分）if，whether （表達是否的意義，但不做句子成分）； 連接代詞：who，whom，whose，what，which，whatever，whoever，whichever（有詞義，在句子中可作主語、表語、賓語）；連接副詞：when，where，why，how，how many，how long，how far，however，whenever，wherever （有詞義，作從句的狀語）．學習時，要注意區分和掌握．

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