3
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“Which” or “what”

Much of (what/which) scientists know about dinosaurs has been recently discovered. The phenomenon of (what/which) are known as corporate networks has also attracted attention. And yes, the ...
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Possible Duplicate: "Which" vs "what" - what's the difference and when should you use one or the other? Q: What's the rule-of-thumb on "for which" vs. "for what" ...