Continued fraction: simplify from the bottom up

1. A.
   $\frac{2}{3}$
2. B.
   $\frac{5}{4}$
3. C.
   $\frac{4}{5}$
4. D.
   $\frac{3}{2}$

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1. A.
   $\frac{67}{29}$
2. B.
   $\frac{41}{17}$
3. C.
   $\frac{45}{19}$
4. D.
   $\frac{47}{20}$

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1. A.
   $\frac{8}{5}$
2. B.
   $\frac{17}{12}$
3. C.
   $\frac{7}{5}$
4. D.
   $\frac{9}{7}$

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