ask us to study hard 和 ask us studying hard 的区别

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ask us to study hard 和 ask us studying hard 的区别

ask us to study hard 和 ask us studying hard 的区别
ask us to study hard 和 ask us studying hard 的区别

ask us to study hard 和 ask us studying hard 的区别
没有ask sb doing sth这种形式
只有ask sb to do sth.