This is the material ______ in the laboratory last week.
A: to be tested
B: B. testing
C: being tested
D: D. tested
A: to be tested
B: B. testing
C: being tested
D: D. tested
举一反三
- I had no idea of the machine _______ already. A: to test B: having been tested C: testing D: having tested
- A new theory ______ before it can be put into practice. A: must be tested B: be tested C: can be tested D: to be tested
- You can’t use the machine because it __________________ (not test) yet. A: has not been tested B: was tested C: has tested
- . Which of the following is true'? A: . a compulsory VHF-DSC radiotelephone installation must be daily tested without radiation. B: a compulsory VHF-DSC radiotelephone installation must be annually tested without radiation C: a compulsory VHF-DSC radiotelephone installation must be monthly tested without radiation. D: a compulsory VHF-DSC radiotelephone installation must be weeklv tested without radiation.
- You can't use the machine because it ___ yet. A: has not tested B: has not been test C: has not been tested