Who is this kind of machine invented by?<br />Sorry, I don't know. Let's go to ask Mr. Zhang.<br />Question. What does the man want to know?<br />Who is this kind of machine invented by?<br />Sorry, I don't know. Let's go to ask Mr. Zhang.<br />Question. What does the man want to know?
A . He wants to know who invented the machine.B . He wants to know when the machine was invented.C . He wants to know what the machine was used for.
