A boy or girl living in a big city has a better general knowledge than a village boy or girl has and ____ well-informed about the affairs of the world. Thus a child born and bred in the city is more enlightened than a child born and brought up in rural atmosphere.
(A) being
(B) be
(C) are
(D) is
答:(D)
請問要怎麼判斷答案跟其他選項,謝謝