The answer insisted on dónde, but there is no question being asked here. So I do not see the reasoning. The rest of the sentence could easily be considered (actually is) the major clause: "I don't know" I think your answer is wrong, or at best an alternative.
Hi there Marc ...
No, "dónde" is indeed correct. Whenever it relates [or refers] to a question, then the accent is definitely required. Here, part of the same scenario could well involve you saying to yourself: "Where have I put the keys to the car?"
This^ same rule applies to other interrogative pronouns, e.g., qué, cómo, cuándo and others.
What does "relate to a question" mean? "Where have I put the keys" is a question; "I don't know where I put the keys" is a statement. I'm supposed to guess "scenarios?" Whatever they are.
Why aren't both forms correct?
If you can compose a question which is relevant to [or describes] the situation being portrayed by the statement, then the accent is required in the statement.
this is an indirect interrogative sentence that takes the form of a statement but it has a question inside. It's the same in English, you can also make indirect questions by starting the sentence with for example:
I wonder when the train will arrive.
I'd like to know how you did it.
She was asking why I was so rude.
You can see the questions inside those, although there is a change in the placement of the verbs in English, but they work the same way as in Spanish. They are also indirect questions.
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