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я не знал, какую

I didn't know which one to

→ я
phrase Rare #49,049
I didn't know which one to Used when the noun being referred to is feminine and understood from context; какую agrees with that omitted noun.
RU: Я не знал, какую выбрать.
EN: I didn't know which one to choose.

Я не знал, какую покупать.

I didn't know which one to buy.

Я не знал, какую выбрать.

I didn't know which one to choose.

Я не знал, какую мне покупать.

I didn't know which one to buy.

Я не знал, какую купить.

I didn't know which one to buy.