Mrs Li has worked____an engineer____.A as,since a long time ago B as,for a long time应该选B吧?理由?

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Mrs Li has worked____an engineer____.A as,since a long time ago B as,for a long time应该选B吧?理由?
Mrs Li has worked____an engineer____.
A as,since a long time ago B as,for a long time
应该选B吧?
理由?

Mrs Li has worked____an engineer____.A as,since a long time ago B as,for a long time应该选B吧?理由?
B as,for a long time
A 中的 ago 与 since矛盾

A since是现在完成时态的一个明显标志

现在完成时啊

对,是应该选B
做某事一段时间,只能用“for……”,第一个选项中的表达方式不应用在这种情况下。

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