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  3. This normally takes from five days to one week for a person to adapt to reversed routine of sleep and wakefulness, sleeping duri

This normally takes from five days to one week for a person to adapt to reversed routine of sleep and wakefulness, sleeping duri

admin2017-06-15  93
问题 This normally takes from five days to one week for a person to adapt to reversed routine of sleep and wakefulness, sleeping during the day and working at night.
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答案形式主语错误，应把句首的This改为It。
解析 该句真正的主语是后面的不定式，由于主语太长，所以将其放在句尾，并用It作形式主语，且It takes sb．sometime to do sth．为固定表达。
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