밑줄친 부분이 맞는 문장인가요? 해석 상 왜 수동태 문장이 들어가는 걸까요?
자세한 설명 좀 부탁드립니다.

we do not hear with our eyes, but sometimes it almost seems as if we do. an environment-agency official tells a surprising incident about some peoplewho lived in an apartment building close to a busy state highway. the families were made miserablyby the noise, and they complained to the city government. city officials went to the state capital again and again to ask that somethingbe done about quieting the highway noise. they were put off repeatedly. at last the city officials had an idea. they planted a single row of trees in front of the apartment house. the trees made hardly any difference in the amount of noise, but theydid block the view of the highway. after that, there were veryfew complaints from the people in the building.