题目内容
18.The mobile phone has changed people's life a lot ________ it was invented.( )| A. | until | B. | since | C. | before | D. | after |
分析 自从发明了手机,它已经大大地改变了我们的生活.
解答 答案:B.
Until直到…时,since,自从…以来,引导时间状语从句,主句用现在完成时,before,在…之前;after在…之后.根据The mobile phone has changed people's life a lot,可知主句使用了现在完成时,所以后面用since引导.故选B.
点评 理解各个选项的含义,根据上下文的语境进行作答.
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