初中英语常用介词的辨析填空题

Chinese scientist Yuan Longping，renowned for developing the first hybird rice strain，died of organ failure at 91 　 　May 22th，2021.

I want to learn a second foreign language          English．（　　）

A．exceptB．besideC．besidesD．except for

Most of the villagers took part in the Dragon Boat races       9：00a．m．         the morning of June 7．（　　）

A．at． inB．on．onC．on ，inD．at ，on