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.

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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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