My wife is feeling very ill right now so she will not be able to make it today. She is ..... treatment for cancer and the radiation makes her nauseous.

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My wife is feeling very ill right now so she will not be able to make it today. She is ..... treatment for cancer and the radiation makes her nauseous. (*) in (*) on (*) out (*) under

This is a companion discussion topic for the original entry at https://english.best/questions/17347,my-wife-is-feeling-very-ill-right-now-so-she-will-not-be-able-to-make-it-today-she-is-___-treatment-for-cancer-and-the-radiation-makes-her-nauseous/