题目内容
【题目】So far no one has______convincing evidence of why dinosaurs died out,and it remains a mystery.
A. come about B. come into
C. come up with D. come out
【答案】C
【解析】考查动词词组。A. come about 形成,产生; B. come into进入;C. come up with提出; D. come out出现。到目前为止,就为什么恐龙灭绝了这个问题还没有人提出一个令人信服的解释。故选C。

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