I think the sentence could be more complete if you said you attached those copies to what. I'd say the first choice.
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Anonymous2. I have attached copies of my graduation timeline and research project for you to review.That seems acceptable.
KhoshtipManI think the sentence could be more complete if you said you attached those copies to what.The assumption is that they have been attached to the email that is being sent. There is no need to add this.
fivejedjon Anonymous2. I have attached copies of my graduation timeline and research project for you to review.That seems acceptable.Thanks a lot teacher. But why is number 1 wrong? Is it because 'a copy of' implies that both are in one document, meaning that I attached only one document?