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(2014届浙江省宁波市十校高三3月联考英语试卷)
Up to now, no one has come up with a(n)        explanation of why dinosaurs died out, and it remains a mystery.

A.astonishing B.amusing C.convincing D.puzzling
科目 英语   题型 单选题   难度 中等
知识点: 形容词的宾语从句
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