( ).Li Yang gave us a talk in Hongshan Gym___ the morning of Feb.28.A.of B.in C.on D.at

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( ).Li Yang gave us a talk in Hongshan Gym___ the morning of Feb.28.A.of B.in C.on D.at

( ).Li Yang gave us a talk in Hongshan Gym___ the morning of Feb.28.A.of B.in C.on D.at
( ).Li Yang gave us a talk in Hongshan Gym___ the morning of Feb.28.A.of B.in C.on D.at

( ).Li Yang gave us a talk in Hongshan Gym___ the morning of Feb.28.A.of B.in C.on D.at
( ).Li Yang gave us a talk in Hongshan Gym___ the morning of Feb.28.
A.of B.in C.on D.at
选项是C
具体某天的早上用介词on