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They should be at school by eight o'clock.
句中为什么用by?
人气:351 ℃ 时间:2020-01-28 03:55:22
解答
they should be at school - 他们必须已经来到学校,已经在校园里
by eight o'clock - 在八点钟或之前
by - 最迟 的意思
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