Thereasonwhythedinosaursdiedoutremainsunknown.They
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问题详情:
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
【回答】
B知识点:虚拟语气与情态动词
题型:选择题
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