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2016职称英语卫生类考试句型：

主语＋肯定谓语＋until＋从句

请比较：主语＋否定谓语＋until+从句.

如：

I worked until he came back.我一直工作到他回来。

I didn't worked until he came back.他回来我才开始工作。