Hi KT_QXQ,
If you just completed the students enroll and not actually deleted the student from the course you should be able to go to the people screen click on the 3 dots on the left hand side of the screen and view prior enrollments. From there can click on the students name and then Students grades to be able to see all the grades the student received in the class.
Alternatively you can go into the gradebook and go to individual gradebook, click on include prior enrollments and then export the students grades from there.
If you actually deleted their enrollment you will need to re-enroll the student into the course get their grades and then delete them again.
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