@anon314285 - Yup, a woman can definitely get pregnant if only one tube is functioning. It would be more difficult, because each ovary only releases an egg every two months, so there would be fewer chances for the woman to become pregnant. But, as long as there isn't anything else wrong, it's definitely possible.
If you're hoping it will work as some kind of birth control I would talk to a doctor, because whatever has stopped one tube from working might have affected the whole reproduction system and a doctor could tell you how you could adapt to using timing as a birth control.
If you're worried about not being able to get pregnant I would talk to a doctor about that as well, since they'll know best how likely your chances are with impaired fallopian tube function.
Either way, good luck!