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

試題分析：A．a(chǎn)stonishing 令人驚訝的，B．a(chǎn)musing令人發(fā)笑的，C．convincing令人信服的，D．puzzling令人困惑的，句意：直到現(xiàn)在，沒有人給出一個(gè)令人信服的解釋為什么恐龍會(huì)滅絕，這仍然是和迷。所以選C。
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