I bought a clock in a shop on last sunday afternoon.这句有错误,书上说去掉ON,为什么?

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Iboughtaclockinashoponlastsundayafternoon.这句有错误,书上说去掉ON,为什么?Iboughtaclockinashoponlastsundayafternoo

I bought a clock in a shop on last sunday afternoon.这句有错误,书上说去掉ON,为什么?
I bought a clock in a shop on last sunday afternoon.这句有错误,书上说去掉ON,为什么?

I bought a clock in a shop on last sunday afternoon.这句有错误,书上说去掉ON,为什么?
就是这样的,没有为什么