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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A．Her suitcase.B．Some rocks.C．The leaves.D．A pillow.
A．Her suitcase.
B．Some rocks.
C．The leaves.
D．A pillow.
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