1.------ you

1.---___ you ___ (take) the medicine yet?
---Yes.I ___ (do) it an hour ago.
2.--- Where is Miss Wu?
--- She ___ (go) to England business.
3.Since then be ___ (work) at this factory.
以上的题目是用所给单词的适当形式填空.
4.The Greens have stayed in China for three years.（改为同义句）
The Greens ___ ___ China three years ago.

1 Have taken have done
2 has gone to
3 可能是 working
4 可能是 left for
再问： 那个打错了，应该是Since then he ___ (work) at this factory.
再答： 那应该是 has been working，凭感觉，答案不一定正确。 参考答案，仅供参考。~~

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