Nobody knows for sure how dinosaurs died out 65,000,000 years ago. It _______ because of sudden changes of their living conditions.A．must have happenedB．would -高中英语-n多题

◎ 题干

Nobody knows for sure how dinosaurs died out 65,000,000 years ago. It _______ because of sudden changes of their living conditions.

A．must have happened	B．would have happened
C．should have happened	D．might have happened

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