【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】考查動詞詞組。A. come about 形成，產(chǎn)生； B. come into進(jìn)入；C. come up with提出； D. come out出現(xiàn)。到目前為止，就為什么恐龍滅絕了這個問題還沒有人提出一個令人信服的解釋。故選C。

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