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      Question

      Improve the bracketed part of the sentence.

      Scientists (have developed) an “organ-on-a-chip” platform to study how drugs are transported across the human placental barrier.
      A have develop Correct Answer Incorrect Answer
      B has developed Correct Answer Incorrect Answer
      C is develop Correct Answer Incorrect Answer
      D No improvement Correct Answer Incorrect Answer

      Solution

      The correct answer is D

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