I cleaned my classroom _ Awith there hours B.three hours ago

I cleaned my classroom _ Awith there hours B.three hours ago I cleaned my classroom(A with three hours Bthree hours ago C I cleaned my classroom _____ A.with there hours B.three hour spend three hours _ (finish) my homework I think he ______(finish) his homework three hours ago I left my room two hours ago.(同义句） A plane left Beijing three hours ago Mike ____ his homework three hours ago. I fell off my bicycle two hours ago,能不能用 in two hours I did my homework three hours before 改错 I have been over my homework for three hours I often play with my grangmother fou three hours.