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Thereasonwhythedinosaursdiedoutremainsunknown.They

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问题详情：

Thereasonwhythedinosaursdiedoutremainsunknown.They

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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