how long has lucy been a nurse ---------------------------[since 2002;four years ago]

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howlonghaslucybeenanurse---------------------------[since2002;fouryearsago]howlonghaslucybeenanurse-

how long has lucy been a nurse ---------------------------[since 2002;four years ago]
how long has lucy been a nurse ---------------------------[since 2002;four years ago]

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

6 years

since 2002
回答完成体,用since
ago使用与过去时

since 2002, 意思是lucy从2002年到现在当了多少年的护士,要是four years ago 就不存在疑问了