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Up to now, no one has come up with a(n)       explanation of why dinosaurs died out, and it remains a mystery.
A.astonishingB.amusingC.convincingD.puzzling
C

试题分析:A.astonishing 令人惊讶的,B.amusing令人发笑的,C.convincing令人信服的,D.puzzling令人困惑的,句意:直到现在,没有人给出一个令人信服的解释为什么恐龙会灭绝,这仍然是和迷。所以选C。
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