The accident happened ______ a freezing winter morning. 
#46382
A
on
B
in
C
at
D
since
推荐题目
The young man are walking        the park.
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A
across
B
cross
C
through
D
though
The robber was caught by two men ______ police uniform _________.
#51266
A
in; at the once
B
in; at once
C
on,; at the once
D
on; at once
Don’t try to do everything at once. Take it a bit __________.
#50785
A
at times
B
at that time
C
at all times
D
at a time