题目内容
14.-Can I watch TV now,Mum?-No,you can't watch ______ you finish your homework.( )
A. | as | B. | after | C. | until |
分析 --我现在可以看电视吗,妈妈?--不,直到你完成你的家庭作业,你才能看电视.
解答 答案:C.as意思是"当…的时候"引导时间状语从句,表示两个同步进行;after意思是"在…之后",引导时间状语从句,表示一个动作发生在另一个动作之后;until意思是"直到"引导时间状语从句,经常和not连用,构成结构"not…until…"意思是"直到…才…"表示直到某个时间才发生另一个动作.根据"you can't watch"以及"you finish your homework"可知完成了作业,才能看电视,所以此处构成了结构"not…until…"所以要用until来填空,故选C.
点评 首先要掌握这几个从属连词的意思以及用法,然后结合具体的语句就可以确定正确答案.
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