Hi Anne - on its own, there's nothing wrong it, but the kwiz question I think you're referring to asks for The letter had been sent by Einstein himself which requires the pluperfect tense.
Hope that helps!
Hi Anne - on its own, there's nothing wrong it, but the kwiz question I think you're referring to asks for The letter had been sent by Einstein himself which requires the pluperfect tense.
Hope that helps!
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