He didn't know what role Alex plays/played in our company. If Alex is still playing a role in your company, then both tenses are possible. If Alex has left the company, then 'plays' is not possible.
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fivejedjonI don't know that 'constant is necessarily an appropriate word. It could be that Alex is somebody who drops in occasionally for some purpose. It could be that his visits are important to the morale or functioning of the company, so he plays a role, but it is not constant.Well, I just want to express that his role at past (the time when he didn't kno