副词
中文翻译：到目前为止
同义词：
['to date', 'up to now']
例句：
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1. We have been working on this project for so far.
我们到目前为止一直在做这个项目。
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2. The movie is based on a novel that was published so far.
这部电影是根据一部迄今已出版的小说改编的。
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3. I haven't seen the play yet, but I heard it's very good, so far.
我还没看过那出戏，但听说它到目前为止非常好。