We had an art festival ________ April 20th， 2020．（ ）
| A． |
on |
B． |
in |
C． |
at |
D． |
for |
We had an art festival ________ April 20th， 2020．（ ）
| A． |
on |
B． |
in |
C． |
at |
D． |
for |
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