To give an actual example,
"This is the book read by my student." could have any meaning of these by context?
"This is the book which is read by my student."
"This is the book which was read by my student."
"This is the book which has been read by my student."
I'd say it could be the second or third. If it said students, there would be a case for arguing the present. As you say 'student' it is unlikley that they will read the same book habitually. :D
Astro-D
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