单选题：By next$uInnler John__________ in his factory for 3 year．

题目内容：

By next$uInnler John__________ in his factory for 3 year． A．have been working
B．will have been working
C．will be working
D．has worked

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

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