11．Man must keep in mind that it will be years ______ the earth recovers from the damage he makes to it．（　�。�
A．whenB．beforeC．sinceD．until

分析 人類必須要記住：地球需要很多年才能從所遭受的毀壞當中恢復．

解答 答案：B
句型搭配it will be+時間段+before從句，表示多久以后才；when當…時候，since自從，until直到．故選B．

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(qū)分和掌握．

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