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Mr. Smith in this factory for 20 years already.
A. works B. will work C. has worked D. is working
C ¡¾½âÎö¡¿¾äÒ⣺ʷÃ×˹ÏÈÉúÒѾÔÚÕâ¼Ò¹¤³§¹¤×÷ÁË20ÄêÁË¡£¿¼²é¶¯´Êʱ̬±æÎöÌâ¡£for 20 years±íʾһ¶Îʱ¼ä£¬alreadyÒѾ£¬¶¼ÓÃÓÚÏÖÔÚÍê³Éʱ£»Ö÷ÓïMr. SmithÊǵ¥ÊýµÚÈýÈ˳ƣ¬Ðè½èÖúhas+¹ýÈ¥·Ö´Ê¹¹³ÉÏÖÔÚÍê³Éʱ¡£¸ù¾Ý¾äÒâ½á¹¹£¬¿É֪ѡC¡£
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