What kind of sampling does a quasi experiment use?

A quasi experiment does not use completely randomized sampling where every participant in a certain sample would be allocated completely by chance and would have the same chance of becoming the member of a sample. Rather, quasi experiments have selective sampling where participants have been allocated to a certain sample by a certain criteria which makes the sample not completely random. 

In windows explorer, select the file, folder, or groups of files and folders you'd like to copy. you can select multiple files or folders in several ways: click the first file or folder you want to select, hold down the ctrl key, and then click each additional file or folder you want.