I got the correct answer by using much and many differentiation. My question is regarding exposed to and exposed. I read in previous post that split infinitive shouldn't be used at the end of sentence. Can't make head and tail out of that. I know infinitive is to, what is split infinitive, is it where the sentence ends, is this a grammatical rule? Honestly the sentence is not ending there. Coming back to original question which one is a better usage exposed to or are exposed?
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