On the Past Perfect Continuous and Past Perfect Simple

Hi,

Could I have your answers to these tenses exercise?

On the Past Perfect Continuous and Past Perfect Simple.
Taken from National Exams.

1- Leila missed the interview yesterday morning; her train (already, to leave) ……………… the station when she got there.
National Exam of 2008.(Catch-up)
Science

2- Before she became a doctor, Salma (already-to work) ................... as a biology teacher for 2 years.
National Exam of 2008.
Science

3- ''No one was killed because meteorologists (to warn) ............... the authorities long before the disaster took place,'' the reporter said.
National Exam of 2008.
Literary

Mine are:
1- Had already left.
2- Had already been working.
3- Had been warning.


Thanks for your help.

I agree with you on #1.
For #2, yours is grammatically correct, but I would have answered "had already worked."
For #3, yours is grammatcially correct, but I would have answered "had warned" -- although "warned" is also okay. Your is correct if the warnings were repeated.

If there is supposed to be only one correct way to write each one, it's a flawed exam.

Thanks a lot Bar. You ruled out my doubts. I found more than one possibility and wanted to know if somebody else felt the same.

Thanks for your help.