"Do you know when the Belt and Road International Day is？"
"Yes，it is____December 16th．"（ ）
| A． |
at |
B． |
on |
C． |
in |
"Do you know when the Belt and Road International Day is？"
"Yes，it is____December 16th．"（ ）
| A． |
at |
B． |
on |
C． |
in |
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