__________ this material can be used in our factory has not been studied yet.
举一反三
- Our hen is still ______and no chicken has been ______yet.
- You can't use the machine because it ___ yet. A: has not tested B: has not been test C: has not been tested
- You can’t use the machine because it __________________ (not test) yet. A: has not been tested B: was tested C: has tested
- Another new factory has been built near _________ used to be a village. A: what B: That C: which D: Where
- ______ and ______ they will meet has not been decided yet.