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She _____ for ten hours at least.It was at nine that she fel

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She _____ for ten hours at least.It was at nine that she fell asleep last night.
为什么是slept
后句说的是她昨晚十点睡觉,所以从昨晚到现在至少睡了十个小时.可能会考虑到现在完成时态,但需注意,sleep 是一个延续性动词,它本身就可接时间段.所以这里用slept就行.类似的用法:
It rained for a week.