翻译:自从有人在城市居住以来,就一直在污染其空气
问题描述:
翻译:自从有人在城市居住以来,就一直在污染其空气
答
Since people came here, the air was polluted seriously.
答
Since people live in the city, they have been polluting the air of the city.
要用现在完成进行时,表示一直在污染.