They spend a lot of time____(visit)the Palace Museum.

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They spend a lot of time____(visit)the Palace Museum.
They spend a lot of time____(visit)the Palace Museum.

They spend a lot of time____(visit)the Palace Museum.
visiting

visiting
spend doing
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visiting spend ...doing 花。。。去做某事

spend……on doing花……在做什么上面
答案是:on visiting