Do I cite the same source in every sentence of a paragraph?
Not necessarily. If it is clear the whole paragraph draws on one source, cite it at the first mention and again if there is any chance of ambiguity, particularly if you introduce your own analysis partway through. The test is whether a reader can always tell whose idea they are reading.
This comes up on APA 7 In-Text Citations, where it is answered in the context of the work itself.
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