This normally takes from five days to one week for a person to adapt to reversed

游客2023-12-01  21

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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