Will you take upteaching as a career after graduation —Hard to say I _______ go abroad for higher education instead

It’s true that whoever ____positive for H7N9 will receive free medical treatment from our government without delay

Would it bother you if I talked to youfor a minute— ____.

下列句中加点的“于”用法和意义解说正确的一项是（　　）①仲尼岂贤于子乎　②于斯三者何先　③躬自厚而薄责于人　④君子之至于斯也

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