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Scientists believe that either volcanic activity or large meteor impacts______wh
Scientists believe that either volcanic activity or large meteor impacts______wh
游客
2025-06-11
19
管理
问题
Scientists believe that either volcanic activity or large meteor impacts______what led to the extinction of the dinosaurs.
选项
A、is
B、has been
C、are being
D、are
答案
D
解析
that从句“that…dinosaurs”的谓语动词空缺,空格前的主语为either A or B(A或B中任一的)结构,动词应与B(large meteor impacts)保持单复数一致,故动词的复数形式(C)和(D)为备选答案。根据上下文语义,此处意为“火山活动或流星冲撞导致了恐龙的灭绝”,因此用于表示当前状态的一般现在时(D)are为正确答案。(C)are being为现在进行时,表示现在正在进行的动作,与上下文语义不符。作为参考,what从句“what…dinosaurs”是充当be动词are的补语的名词性从句。
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