I was very to see our teacher at the party because he was ill.A. interestedB. surprisedC.

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A. interested
(答案→)B. surprised
C. surprising
D. surprise
解析：interested感兴趣的；surprised吃惊的；surprising令人吃惊的；surprise惊奇，使吃惊。在晚会上看到我们的老师，我很吃惊，因为他病了。结合语境可知选Ｂ。