For two centuries, price theory _____ the centre of attention of economists. to has been has been to have been have been
For two centuries, price theory _____ the centre of attention of economists.
to has been
has been
to have been
have been
Гость
Ответ(ы) на вопрос:
ГостьОтвет: Has been
Так как "For two centuries" используется в Present Perfect
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