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Thereasonwhythedinosaursdiedoutremainsunknown.They

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問題詳情：

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

知識點：虛擬語氣與情態動詞

題型：選擇題

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