By now, no one has _______ a convincing ...

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

C 【解析】考查动词短语。A. come about形成，产生；B. come into进入；C. come up with提出，想出；D. come out出现，出版。句意：没有人想出一个为什么恐龙灭绝的令人信服的解释，它仍然是一个谜。故选C。

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