Today is my sister's ____（20）birthday.

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Todayismysister''s____（20）birthday.Todayismysister''s____（20）birthday.Todayismysister''s____（20）birthda

Today is my sister's ____（20）birthday.
Today is my sister's ____（20）birthday.

Today is my sister's ____（20）birthday.
twentieth

twenty
或者20th
都行
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