The dialog you quote doesn't provide enough context for a definitive answer to your question. In general however, in the scenario you outline, either word could be used. " Could elicit either of the following answers, depending on the situation and the preference of your interlocutor.
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chenyinchengAnd I'd expect an answer like 'It's the third building on the left.' instead of answers like 'It is a/an ________.'Me too. Personally, I don't care for that little exchange in the EFL book either. Nevertheless, in that situation what and whichtend to be used somewhat interchangeably by many speakers, so, at least in that sen
chenyinchenghow this is interchangeable"tends to be used interchangeably" does not mean "is interchangeable". I'm saying that your analysis is correct, but that you should not be surprised to hear either "which" or "what" in many situations.
CalifJimchenyinchenghow this is interchangeable"tends to be used interchangeably" does not mean "is interchangeable". I'm saying that your analysis is correct, but that you should not be surprised to hear either "which" or "what" in many situations.
CJ
I see. Thank you very much!!