【题目】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
在线课程【答案】C
【解析】考查动词词组。A. come about 形成，产生； B. come into进入；C. come up with提出； D. come out出现。到目前为止，就为什么恐龙灭绝了这个问题还没有人提出一个令人信服的解释。故选C。