题目内容
6.It takes a long time to restore nature_______ it is damaged.( )A. | since | B. | unless | C. | once | D. | until |
分析 一旦被破坏,要花很长时间才能恢复自然.
解答 答案:C.根据选项since自从…,unless除非…,once一旦,until直到…,再结合句意,一旦被破坏,要花很长时间才能恢复自然,可知此处缺少了一个引导时间状语从句的连接词,故C正确.
点评 本题考查时间状语从句的连接词,在充分分析句型再结合语义的基础上便能选出正确答案,同时要注意其他选项的意思,
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