keep at与 keep on与 keep up如何区别

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keepat与keepon与keepup如何区别keepat与keepon与keepup如何区别keepat与keepon与keepup如何区别keepat坚持,坚持做下去;纠缠,坚持,使不停地做ke

keep at与 keep on与 keep up如何区别
keep at与 keep on与 keep up如何区别

keep at与 keep on与 keep up如何区别
keep at坚持,坚持做下去;纠缠,坚持,使不停地做
keep on继续;穿着…不脱,继续进行,继续不断
keep up保持;继续;不低落;不落后