They should be at school by eight o'clock.

学习时间:2026-10-22 08:25:57 阅读：1550

They should be at school by eight o'clock.句中为什么用by?

玩命的鸡翅

2026-10-22 08:25:57

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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