many times should I to take the medicine 中间空着的怎么填?I 后面、to前面空格

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many times should I to take the medicine 中间空着的怎么填?
I 后面、to前面空格

填have.
have to do表示不得不做某事.
我应该吃几次药?

为你解答。
How many times should I (need,需要) to take the medicine?
我需要服几次这种药?
解释:need to do,需要做某事。