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Which version is correct?
1. I'm not sure whether it was Mary. I shouldn't wonder if it was her older sister.
2. I'm not sure whether it was Mary. I shouldn't wonder if it had been her older sister.
Which version is correct?
1. I'm not sure whether it was Mary. I shouldn't wonder if it was her older sister.
2. I'm not sure whether it was Mary. I shouldn't wonder if it had been her older sister.
both.
I should not ponder if/whether it was/had been her older sister.
Tricky mixed conditional 
Re: Tricky mixed conditional 
Thanks!
Linear Mode
