My mother got up twenty minutes ago.同义句转换

题目

My mother got up twenty minutes ago.同义句转换
___ ___ twenty minutes ___ my mother ___ up

答案

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My mother got up twenty minutes ago.
二十分钟前,我妈妈起床了.
= (It is) twenty minutes (since) my mother (got) up.
自我妈妈起床来,已经（过去）二十分钟了.
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