题目内容
2．I have been in China 1997．（ ）| A． | since | B． | for | C． | in | D． | until |
分析 自从1997年我就来到了中国．
解答 答案：A．
结合设空处前面的"I have been in China"用了现在完成时可以推断这句话表达的意思是"自从1997年我就来到了中国．"，since+时间点，通常用在现在完成时中，表示动词从过去某一时间开始持续到现在，所以设空处的介词应该填"自从"，故选A
点评 了解每个介词的含义是做好此类题型的关键，还要从句意着手，根据句意作出解答；所以，平时的学习中要多进行积累词汇，才能很好的完成．
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