The boy finally admitted ______ the window when ______ football.

问题描述:

The boy finally admitted ______ the window when ______ football.
1.to have broken;playing
2.having broken;played
3.broke;played
4.breaking;playing

admit做“承认”讲的时候后面接sth/to doing sth(to为介词) 所以排除1、3
而when引导时间状语从句,表当时正在进行,所以选4