Some parts of the sentences have errors and some are correct. Find out which part of a sentence has an error and corresponding to the appropriate correction option. If a sentence is free from error, corresponding to 'No error' option.
We have finished our work three hours ago and have been waiting for you since then
-
three hours ago and have been waiting
-
we have finished our work
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for you since, then
-
No error
B.
we have finished our work
Remove 'have'. This part of the sentence should be in Past Indefinite tense.