请问·he begins ( ) ( clean ) the floor after school中间填什么啊?为什么拟

请问·he begins ( ) ( clean ) the floor after school中间填什么啊?为什么拟 He must-----(clean) the classroom after school.这里填什么啊?为什么呢? 请问School begins the day after tomorrow 句中的begins为什么要用第三人称单数? 请问School begins the day after tomorrow 句中的begins为什么要用复数? They ____(clean) the street after school .应该填什么呢? R_____ to clean the classroom after school中的空填什么 ( )hearing the news,he burst into tears请问填什么介词,为什么不能用after After cleaning the floor,I went on to clean the window.为什么打扫 My teacher made me什么the classroom last week中间为什么填clean Go u Your bedroom is on the second floor 中间那里该填什么啊 You must clean the classroom, you? 中间要填什么 after cleaning the windows,he [ ] the floor