They usually go to school _____(on\at)_______(weekends\weekend).

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They usually go to school _____(on\at)_______(weekends\weekend).
They usually go to school _____(on\at)_______(weekends\weekend).

They usually go to school _____(on\at)_______(weekends\weekend).
on weekends
onweekend 是固定搭配
又因为常常去,所以是多个周末,用复数形式s