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For two centuries, price theory the centre of attention of economists. to has been has been to have been have been

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Ответ:   has been так как "for two centuries" используется в present perfect

Iwas at the concert of my favorite band (название группы) yesterday. and it was awesome! i'm sure i will never forget that. there were a lot of people who were making really loud noises. i was afraid that i wouldn't be able to hear songs in that crowd. but when the band appeared on the stage and started to sing a song the crowd stopped making noises at once. i was so happy at that moment. because the band means a lot to me. they have changed me, changed my whole world. and i'm really grateful to them for everything they have done for me. so, i can say it was the best concert in my life.

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