中文谷Bynow,noonehas
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问题详情：
By now, no one has _______ a convincing explanation of why dinosaurs died out, and it remains a mystery.
A. come about B. come into
C. come up with D. come out
【回答】
C
知识点：词组 短语
题型：选择题
标签：
Bynownoonehas
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