When was the telephone invented,do you konw?为什么这里用was不是were?

when the boy was ①.while we （have）dinner,the telepho①.while we （have）dinner,the telephone rang. ②.what you （do） when your mother came cable? ③.we （read）books while he （watch when was the book published? when was the car invented when was the birthday party when was the machine produced when was the meal?意识 the day when the article was written 四 用所给词的适当形式填空1.Tom ______ (be) ill last week,he ______ (be) much better now.2.Jimmy and his sister _______ (be) here several days ago.They ________ (leave) for Beijing yesterday.3.He ___________ (have ) a bath when the telepho when was the Nanpu Bridge build? When was the saying first used?翻译 when the weather was warm翻译 When was the writer ofthe book b____? When was the day 什么意思 When was the first Earth Day celebated? WHEN THE PIE WAS OPENED怎么样 When was the Internet set up? when was the digital camera developed是什么意思