By the time Ms. Lewis joined our firm as a software developer, she______in the computer software field for many years already.

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问题 By the time Ms. Lewis joined our firm as a software developer, she______in the computer software field for many years already.

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

答案D

解析语法：时态1．选项均由不同时态构成。2．原文的意思是“刘易斯女士最早入职时是作为软件开发员，之前已在计算机软件领域工作数年”，空格内应填入过去完成时(had+过去分词)。因此(D)had worked为正确选项。

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