Complete the sentence with the correct option. Special mixes of concrete __________________________ to withstand the extreme pressures of the massive building weight, and each batch of concrete ____________________________ to ensure it could withstand certain pressures. were made, was tested are made, was tested were made, were tested was made, was tested
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Complete the sentence with the correct option.

Special mixes of concrete __________________________ to withstand the extreme pressures of the massive building weight, and each batch of concrete ____________________________ to ensure it could withstand certain pressures.

  • were made, was tested
  • are made, was tested
  • were made, were tested
  • was made, was tested

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