填空题

No one has _______________________ (做出一个令人信服的解释) why dinosaurs died out.

【参考答案】

come up with a convincing explanation of
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单项选择题
A．Catch the train.B．Hurry to catch the bus.C．Sit next to the bus stop.D．Fix his tom sleeve.
A．Catch the train.
B．Hurry to catch the bus.
C．Sit next to the bus stop.
D．Fix his tom sleeve.
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