By the time Mary joined our company as a programmer, she ______ in the computer

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问题 By the time Mary joined our company as a programmer, she ______ in the computer software field for 8 years already.

选项 A、will have worked
B、worked
C、works
D、had worked

答案 D

解析语法题。题干的意思是，玛丽入职时是程序员，之前已在计算机软件领域工作8年。因此，空格内应填入过去完成时(had+过去分词)。故选D。

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