________ May 2022, we held many events to celebrate the 100th birthday of the Communist Youth League of China.
| A． |
At |
B． |
In |
C． |
On |
________ May 2022, we held many events to celebrate the 100th birthday of the Communist Youth League of China.
| A． |
At |
B． |
In |
C． |
On |
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