alan piays basketball ( ) three hours in the afternoon 1.on 2.for 3.in 4.of

alan piays basketball ( ) three hours in the afternoon 1.on 2.for 3.in 4.of

2 for.
完善下回答吧,知友们期待您耐心详细的解答

...jhgjhvhh

答案：2为正确答案