【題目】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】A. come about 形成、產(chǎn)生； B. come into進(jìn)入；C. come up with想出、提出； D. come out出現(xiàn)、出版。句意：到目前為止，就為什么恐龍滅絕了這個(gè)問(wèn)題還沒(méi)有人提出一個(gè)令人信服的解釋?zhuān)匀皇莻�(gè)謎。所以答案是C。

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