City University of Hong Kong CLASS CLASS
Making Sense of Grammar
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两者都属于情态动词,Must have done 是表示对过去事实的肯定;Could have done 表示过去可能做了某事但事实上并没有做。(有遗憾的意思)
asked Mar 11, 2019 in Questions about English Grammar by 117070300220lly (340 points) | 596 views

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1,435 questions
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12,676 users