How long can he keep/keeps the book?

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Howlongcanhekeep/keepsthebook?Howlongcanhekeep/keepsthebook?Howlongcanhekeep/keepsthebook?keep这里是借的意

How long can he keep/keeps the book?
How long can he keep/keeps the book?

How long can he keep/keeps the book?
keep 这里是借的意思.

是选择吗??用keep.因为can为情态动词,后面加动词原形。

keep

意思是:他能保存那本书多久。