Anonymous Shouldn't it be "have" after "scientists" and also "have" after "they"? If the writer writes in simple past, there is nothing wrong with that. Simple past tells us that the testing and findings are concluded.
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AnonymousShouldn't it be "have" after "scientists" and also "have" after "they"?If the writer writes in simple past, there is nothing wrong with that. Simple past tells us that the testing and findings are concluded.