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

while the boy was walking down the street,the UFO landed同义句4种
英语人气:844 ℃时间:2019-10-18 20:47:27
优质解答
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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