In order to make a clipping mask in Adobe Illustrator CC (2017), which of the following keyboard shortcuts is used?

To create a clipping mask in Adobe Illustrator CC (2017), you don't use a specific keyboard shortcut. Instead, you follow these steps:

1. Select the objects you want to mask.
2. Arrange the objects so that the object you want to use as a mask is in front (you can use the shortcut Ctrl+Shift+] to bring an object to the front).
3. Select all the objects you want to include in the mask.
4. Go to the Object menu, then Clipping Mask, and then click on Make. Alternatively, you can use the shortcut Ctrl+7.

Remember, the top object will become the mask for the objects beneath it.