don't know or wouldn't have known

[jasonlulu_2000]

Thank you very much indeed. If it had not been for your advice, I really ______ what I should have done.
A. don't know B. wouldn't have known

The answer given is A, but I think B is more suitable.

Am I right?

What is a native's opinion?

Thanks!

Jason

 

[philo2009]

Although somewhat less natural/probable in context, (B) is certainly grammatically possible and meaningful, so this is clearly a very poor examination question.

 

[emsr2d2]

They're both possible. As philo said, it's another example of a bad test question.

 

[5jj]

I agree with philo and ems, but feel that if the meaning of B had been intended, a speaker in real life (rather than in bad test questions) would have been more likely to say, "... I wouldn't have known what to do".