We can unscramble the words to form the sentence "Working as a volunteer can be very frustrating," as further explained below.
Whenever we have to unscramble words to form a sentence, we must first look for the nouns and the verbs. They are usually the ones that command the sentence structure, since they are the ones that actually convey the message.
What makes the group of words provided in this question specially difficult is the presence of two -ing words, "working" and "frustrating". They can be verbs or not, so we must be able to identify what they are. "Frustrating" is normally used as an adjective, and we know "working" can be a noun as well.
We must also notice that there is something missing from the group of words, and that is the verb "be". If we do not add it, the sentence will be incomplete.
With the information above in mind, we can conclude that the correct way to unscramble the words is:
Learn more about unscrambling words here:
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