Which are correct and make sense:

1) They can't have been working on this project since September. They must have started working on it much earlier.

2) They haven't been working on this project since September. They must have started working on it much earlier.

3) They haven't worked on this project since September. They must have started working on it much earlier.


Could one say 'only since September'? Or 'just since September'? Is it necessary to do so?


Gratefully,
Navi

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