题目内容
7.Measures have been taken to solve the problem,but it may be some time ___________the situation improves.( )A. | since | B. | when | C. | before | D. | unless |
分析 已经采取了一些措施来解决这个问题,但可能一段时间后情况才会好转.
解答 答案C.
since意思是"自从…以来"时,引导时间状语从句;意思是"既然"时,引导原因状语从句.when"在…时候",引导时间状语从句.before"在…之前;才…",引导时间状语从句.unless"除非,如果不",在意义上相当于if…not,因此在有些场合中unless与if…not可互换使用,引导条件状语从句."It may be+一段时间+before+从句(句中使用一般现在时)"是固定句型,意思是"可能一段时间后…才…";故答案选C.
since用于句型"It is/has been+一段时间+since+从句(句中使用一般过去时)"中,意思是"自从…以来有一段时间了".
点评 本题考查从属连词的用法.连词的用法辨析,要注意分析主从句之间的逻辑关系,再确定相应的连词,同时注意不同的连词的语义及用法区别.
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