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how long has lucy been a nurse ---------------------------[since 2002;four years ago]
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how long has lucy been a nurse ---------------------------[since 2002;four years ago]
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since 2002
since ...通常用于现在完成时,而 ...ago 通常用于一般过去时.
since ...通常用于现在完成时,而 ...ago 通常用于一般过去时.
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