题目内容
8．-Great changes have taken place in Beijing he left for America in 1989（ ）| A． | since | B． | when | C． | until | D． | while |
分析 自从1989年他去了美国以后，北京发生了很大的变化．
解答 答案：A；
结合语境推断句意是"自从1989年他去了美国以后，北京发生了很大的变化．"，此句中的谓语动词用了现在完成时，本题设空处后面的时间状语从句用了一般过去时，所以结合句意用现在完成时的标志词since引导，故选A
点评 本题主要考查连词的用法，连词在句子中主要起联系上下文的作用，他们之间的区别就是表示逻辑关系的不同，所以在解题时先要理解上下文含义，然后根据上下文逻辑关系选择合适的连词．是做好此类题型的关键．
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