Answered

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Add the phrase that completes a thought in
the sentence.

Add The Phrase That Completes A Thought In The Sentence class=

Sagot :

Parrainidn

Answer: challenging problems

Explanation:

Whatever completes the text would have be something that relates to the problems that are to be solved as this is the subject of the sentence and it would have to be in the negatives due to the use of the word "unfortunately".

The best option is therefore the above because too many challenging problems relates to the subject of problems and is not a good thing.

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