They should be at school by eight o'clock.

学习时间:2026-08-29 02:25:34 阅读：1919

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

文艺的荷花

2026-08-29 02:25:34



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