was written 跟was being written 的差異是什麼??
對於時態有問題的可以參考這支影片,12個時態都有完整介紹到:
https://www.youtube.com/watch?v=tw9KEQLokjo&ab_channel=%E5%93%A5%E5%80%AB%E5%B8%83Columbus
A letter ______ by him at 9 o′clock this..-阿摩線上測驗