I sometimes have difficulty in deciding which determiner, which or what, to use for some sentential situations, like these. What month is it? Which month is it? What school are you attending now? Which school are you attending now? The general guideline in respect to this seems to be that when there are several alternatives or there are several choices to choose from, it is likely that the use of the determiner "which" appropriate eventhough this particular situation doesn't negate the usage of the determiner "what." Do you have some clear guidelines?
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