How to check which audio is playing from Array

Hello there!

I’ve created an AudioClip array, then the script randomly selects one clip from the array and plays it , how can I check which clip from the array is playing ?

/**
* None of this is tested, if you have
* issues, please work them out yourself.
* Learn from experience!
**/
// Written in C#
using System;
using UnityEngine;
using System.Collections;

public class RandomAudio : MonoBehavior
{
	// Store a local copy of an empty AudioClip array
	// Define your clips in your editor
	// If no items display in your editor, remove the 0
	public AudioClip[] audioFiles = new AudioClip[0];
	
	// Store a local int of your audio clip ID
	private int audioID = 0;
	
	// Store a local int of your audio clip array length
	private int audioLength = 0;
	
	// When the application starts...
	public void Start()
	{
		// Get array length, and store it
		this.audioLength = this.audioFiles.Length - 1;
		
		// If no audio,
		if(this.audioLength < 1) {
			// Failed, exit
			Application.Quit();
		}
	}
	
	public void Update()
	{
		// If the audio is not playing,
		// Side Note: this might not be perfect syntax
		if(!gameObject.audio.isPlaying) {
			// Change your audioID
			this.changeAudio();
		}
	}
	
	private void changeAudio()
	{
		// Create a random instance, may need to be = new System.Random(); 
		Random randomNumberGenerator = new Random();
		
		// Set the audioID
		this.audioID = randomNumberGenerator(0, this.audioLength);
		
		// Set the gameObject to use the new audio clip
		gameObject.audio.audioClip = audioFiles[this.audioID];
		
		// Play the audio clip
		gameObject.audio.play();
	}
}