题目内容
7．He has changed a lot _____ I knew him．（ ）| A． | until | B． | after | C． | since |
分析 自从我认识他以来，他已经改变了很多．
解答 答案：C．考查连词．句意"自从我认识他以来，他已经改变了很多．"．A直到．B在…之后．C自从．since引导时间状语从句，主句现在完成时态，从句一般过去时态，答案是C．其它选项时态不符合．
点评 连词可以表并列、承接、转折、因果、选择、假设、比较、让步等关系，要结合语境，选择合适连词用法．
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