The People's Republic of China was founded ____ October 1st， 1949． We'll celebrate its 70th anniversary this year．（ ）
| A． |
in |
B． |
on |
C． |
at |
The People's Republic of China was founded ____ October 1st， 1949． We'll celebrate its 70th anniversary this year．（ ）
| A． |
in |
B． |
on |
C． |
at |
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