It seems gas______from the pipe for some time. We'll have to call the gas company to put it right.
A: has been leaking
B: leaked
C: is leaking
D: had leaked
A: has been leaking
B: leaked
C: is leaking
D: had leaked
举一反三
- It seems oil ( ) from this pipe for some time. We'll have to take the machine apart to put it right.
- He denied _____ any information. A: to leak B: to have leaked C: being leaked D: having leaked
- We had to be patient because it _______ some time _____ we got the full result. A: has been; since B: had been;until C: was; after D: would be; before
- We wish the work could ______ more quickly, but we'd had some difficulties in getting the right kind of supplies. A: have done B: have been done C: have been doing D: be done
- __________your valuable help，we couldn’t have finished the experiment ahead of time． A: If it were not for B: Had it not been for C: Were it not for D: If it has not been for