问题
选择题
Over 50 people were killed because of a crash of city railway in Argentina____ the morning of February 22nd. [ ]
A. in
B. on
C. at
D. of
答案
答案：B
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Over 50 people were killed because of a crash of city railway in Argentina____ the morning of February 22nd. [ ]
A. in
B. on
C. at
D. of
答案：B
