要将Word文档中的一部分文本内容复制到别处，首先要进行______操作。
参考答案：选择
---- Tom, did Mr. Li join you in your discussion?
---- No, he _____, but he happened to have fallen ill.
A．would like to
B．will
C．was to have
D．was going to join
食品工厂管道连接的方式有哪几种？
