Афанасьева, Михеева, 9, 5 год обучения. Учебник. Раздел 1. Часть 5. Упражнение 2

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Закончите предложения, выбрав правильную форму глагола to be.
have been;
had been;
have been;
has been;
had published;
has been introduced;
have been;
has been;
had been;
had been.
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