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（2017年山东德州） --______, there must be life on other planets though none has been discovered. -- I agre...
题目内容：
（2017年山东德州） --______, there must be life on other planets though none has been discovered.
-- I agree with you. The universe is so large after all.
A. To my surprise B. To be honest C. In my opinion D. Again and again
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