while the boy was walking down the street,the UFO landed同义句4种

题目

while the boy was walking down the street,the UFO landed同义句4种

答案

常见的标准变化形式如下：
= The boy was walking down the street when the UFO landed.
= When the boy was walking down the street,the UFO landed.
= The UFO landed while the boy was walking down the street.
= The UFO landed when the boy was walking down the street.
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