It is said that the accident happened _______ a cold winter morning．（ ）
| A． |
in |
B． |
at |
C． |
on |
D． |
for |
It is said that the accident happened _______ a cold winter morning．（ ）
| A． |
in |
B． |
at |
C． |
on |
D． |
for |
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