选c.since
since在完成时态中表示 从具体的哪一年开始
for在完成时态中表示 状态完成了好几年,比如for five years 就是五年
记住这两种用法你可以解决大部分完成时态的时间表达问题
.Mr.Smith has been working in China ___________ 2000.
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