题目内容
1．__________ the damage is done，it will take many years for the farmland to recover．（ ）| A． | Until | B． | Unless | C． | Once | D． | Although |
分析 句意：一旦损坏造成，农田恢复需要很多年的时间．
解答 答案C．
A选项"直到…才（引导时间状语从句）"；B选项"如果不；除非（引导条件状语从句）"；D选项"虽然，尽管（引导让步状语从句）"；C选项"一旦"；其中once引导时间状语从句，有"条件"的意味，表示从某个时间点开始，结果具有偶然性，意思是"一…就…"，引导的从句一般用一般现在时表示将来．由主句it will take many years for the farmland to recover可知，产生这种结果的条件是Once the damage is done故选C，其他选项均不符合句意．
点评 本题考查状语从句中连词的辨析．解答此类题目首先要理解题干的意思，其次要知道各选项的意思，然后依次把各个选项意思放入句子根据语境，不难选出正确答案．关键还是在平时学习的过程中，多积累多总结多记忆．
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