By the end of this year Mr. Smith ;________in our ;company for exactly three years. ( 章节：1 难度：2)
- A、is working
- B、has worked
- C、willwork
- 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：1 难度：2)
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