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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