By the end of this year Mr. Smith () in our company for exactly three years. ( 章节：3 难度：1)
- A、is working
- B、has worked
- C、will work
- D、will have worked
正确答案:D
答案解析:有
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By the end of this year Mr. Smith () in our company for exactly three years. ( 章节：3 难度：1)
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