at the beginning of class,the noise of desks___could be heard outide the classroom?答案是being opened and closed 我想问的是这是分词短语和定语从句转化来的吗?

at the beginning of 造句 at the beginning of 是什么意思? at the beginning of还是 in the beginning of at the beginning of the year造句, 英语翻译首先用at the beginning of``` 英语 翻译 at the beginning of at the beginning of this love . at the beginning of this love at the beginning和in the beginning根本区别,at.后面一定加of吗 how did the writer feel at the beginning of the 请问in the beginning of 与at the beginning of 的区别 at the beginning of.的中文意思还有the beginning of...的中文意思 At the beginning of the year number 是什么意思 at the beginning of the month是什么时态时间状语 at the beginning of the han dynasty怎么翻译 at the beginning of the last century怎么翻译 at the beginning of the stay的中文意思 at the beginning是什么意思?