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Re: Engineering teams monitor over a hundred former nuclear test sites for [#permalink]
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Official Explanation

In the original sentence, two main clauses are incorrectly separated only by a comma, without an appropriate connecting word after the comma. Choice (D) inserts the word and, which makes sense in context—providing an appropriate rhetorical balance between the ideas in the two clauses. Although their levels of radiation is a bit wordier than radiation levels, the phrase is clear and grammatically correct.

The correct answer is (D).
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Re: Engineering teams monitor over a hundred former nuclear test sites for [#permalink]
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