智慧职教: It is of little use _________ a bicycle when you don’t know how ______ it.
举一反三
- If you don't know how to use the machine, you can _____ (寻求帮助)
- You'd better eat with your fingers if you don't know how to use a knife and fork.
- There’s a new machine in your company ,but you don’t know how to use it , so you may ask：________
- We don't know ___ you did it. A: who B: what C: how D: which
- If you don’t want anyone to know it, don’t do it.