I had no idea of the machine _______ already.
A: to test
B: having been tested
C: testing
D: having tested
A: to test
B: having been tested
C: testing
D: having tested
举一反三
- You can’t use the machine because it __________________ (not test) yet. A: has not been tested B: was tested C: has tested
- You can't use the machine because it ___ yet. A: has not tested B: has not been test C: has not been tested
- This is the material ______ in the laboratory last week. A: to be tested B: B. testing C: being tested D: D. tested
- The machine ______, the next step was how to operate it. A: having been installed B: had been installed C: having being installed D: has been installed
- He ______ his breakfast when the morning post came. A: had B: have been having C: had been having D: was having