Question

They have been doing this research . . . the effects of advertising on people for many years.

Выберите один ответ:

To


In


Into

Answer 1

Ответ:

Тo

Объяснение:

to the effects...(1)

Answer 2

They have been doing this research into the effects of advertising on people for many years.

Они проводили это исследование воздействия рекламы на людей в течение многих лет.

Ответ: into