Identify the real subject in the following sentence: The decision of the engineers was to double the chlorine concentration in the water treatment process.

the answer is the second one.

to and without are prepositions, so a, b, and d are prepositional phrases. the adverb phrase is c, about the surprise.

explanation:

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1. it me on problems i dont know.

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4. it fun and easy to use which relives stress.

5.i can prepare myself for tests and quizzes

hope this buddy!

plz mark brainliest

- courtney