翻译：他一进教室就开始做功课.(No sooner … than)*（倒装句）

网友回答

No sooer had he e into the classroom than he began to do his homework.
相信我,（上面两人做的都不对）
======以下答案可供参考======
供参考答案1:
As soon as he enters the classroom to start to do the schoolwork
供参考答案2:
No sooner did he e into the classroom that he did his homework.
供参考答案3:
no sooner did he do his work than he came into the class