Задание №886.
Времена

A major problem in the construction of new buildings is that windows ___ while air conditioning systems ___.
  • have been eliminated, have not been perfected
  • were eliminated, were not perfected
  • had been eliminated, had not been perfected
  • eliminate, are not perfected

  • Решение:
    A major problem in the construction of new buildings is that windows HAVE BEEN ELIMINATED while air conditioning systems HAVE NOT BEEN PERFECTED.
    Основная проблема при строительстве новых зданий заключается в том, чтобы окна были удалены, пока системы кондиционирования не будут усовершенствованы.

    Правильный ответ: have been eliminated, have not been perfected.

    Источник: Тесты по грамматике английского языка для школьников и абитуриентов. Борисенко Т. И., Валентей Т. В.
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