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外语
He______have passed the exam, but he was too careless.
He______have passed the exam, but he was too careless.
admin
2012-07-22
108
问题
He______have passed the exam, but he was too careless.
选项
A、can
B、may
C、must
D、could
答案
D
解析
情态动词题。本题考查情态动词表推测的用法。can have done表示对过去行为的怀疑,用于疑问句,译成“可能做过……吗”;may have done表示对发生过的事情的推测,意思是“可能已经”或“也许已经”,用于肯定句中;must have done表示对过去事情的肯定推测,译成“一定做过某事”,该结构只用于肯定句;could have done意思是本来能够做某事而没有做。根据句意判断,D正确。
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专业英语四级
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