15、The reason why the dinosaurs died out remains unknown. They ______ by an enormous volcanic eruption.
A. would have killed B. might have been killed
C. should have been killed D. must have killed
科目：高中英語 來源： 題型：
The reason why the dinosaurs died out remains unknown. They ______ by an enormous volcanic eruption.
A. would have killed B. might have been killed
C. should have been killed D. must have killed
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