alan piays basketball ( ) three hours in the afternoon 1.on 2.for 3.in 4.of
问题描述：
alan piays basketball ( ) three hours in the afternoon 1.on 2.for 3.in 4.of
答
2 for.
完善下回答吧,知友们期待您耐心详细的解答能告诉我原因吗表示持续了3个小时