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Sounding, which involved dropping weighted lines into the water and noting when the tension disappeared, was one of the several procedures that was an important role to play in early attempting to map the ocean floor.

  • A

    procedures that was an important role to play in early attempting to map

    分析该选项
  • B

    procedures, which was playing an important role in early attempts to map

    分析该选项
  • C

    procedures, an important role to play in early attempting to map

    分析该选项
  • D

    procedures that were important-to-play roles in the early attempts that have mapped

    分析该选项
  • E

    procedures that played an important role in early attempts to map

    分析该选项
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正确答案: E

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