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In the following sentence, should "shed" or "has shed" be used?

Scientists announced on Wednesday that the drug shed/has shed new light on the treatment of amnesia.

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  • Neither are at all likely. It would be much more natural here to say Scientists announced on Wednesday that the drug sheds new light on the treatment of amnesia. There really is no good reason for using Past Tense at all here, let alone Past Perfect. Apr 29, 2021 at 13:44

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Either is grammatical, but has shed is probably preferred, because it implies that the shedding of new light has been happening over a period of time. Just shed technically refers to a single event that happened in the past, which is a possibility. For example, say there was a clinical trial for the drug; it's possible the drug during this trial (a single event) shed new light.

In casual English, either would be fine. In formal English, you probably want to use has shed.

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