语言是讲究语境的,it有时是指上文提到的事,有时是指上文提到的物,在本题的上文中事和物都有,如果还用it 就指代不清了,it是指book 还是指He got his first book published. It turned out to be a bestseller.这件事,容易产生歧义.that 很明显就是指 He got his first book published. It turned out to be a bestseller这件事了.
史上很难解释清楚的一道高中英语单选题.-----如果你不能解释清楚,请不要作答.