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In the excerpt "The gold standard to diagnose endometriosis is surgery to find endometr...

In the excerpt "The gold standard to diagnose endometriosis is surgery to find endometrial tissue outside of the uterus", which voice is the verb "is" in?


A

Passive voice.


B

Subjunctive voice.


C

Middle voice.


D

Active voice.


E

Imperative voice.