The subject-verb agreement rule which is being broken in the sentence above is c<span>ollective subjects functioning as a unit require singular verbs.
The collective subject <em>the crew </em>requires a singular verb, because it denotes a single unit. So, instead of using the verb <em>have visited, </em>it should have been <em>has visited. </em></span>
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D) With the help of local volunteers, many parks and reserves manually remove invasive plants and often animals.
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It's the only answer that makes sense.
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the way the author would convey central idea of the article is by title by the gist(and some times the have a sumaray of text look at that to if there )
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