I must give her medicine in the right time.有啥错?

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Imustgivehermedicineintherighttime.有啥错?Imustgivehermedicineintherighttime.有啥错?Imustgivehermedicinein

I must give her medicine in the right time.有啥错?
I must give her medicine in the right time.有啥错?

I must give her medicine in the right time.有啥错?
in改为
at

must后应该加doing吧

要用at..