As others have said, the sentence is not in the passive voice.
I will give you an easy way to check whether a phrase is in the passive voice or not. Check whether you can omit the name or description of the person carrying out the action. If so: you are looking at passive voice. For example:
The question was asked in the 9:00 class by the tall boy in the front row.
Let's check whether the description of the person doing the asking can be omitted:
The question was asked recently.
Yes, "the tall boy in the front row" can be omitted. Hence, passive voice. (Who did the asking? The sentence doesn't explicitly say.)
Let's try another one.
John brought home some fish for dinner.
The person bringing the fish was John, and we can't omit "John" from the sentence -- it would fall apart. So, active voice.