It is hard to learn the ______ (operate) of this complicated machine.
举一反三
- No matter how hard I tried to explain how to operate the machine, they were still at a loss.
- The ___________ of a big new machine can be hard to learn. A: operate B: operation C: operating D: operative
- I wish I _____ how to operate the machine.
- The of this machine is simple. (operate)
- The _______(operate) of the machine is easy.