—He got his first book published. It turned out to be a bestseller. —When was ? — was in

问题补充：

—He got his first book published. It turned out to be a bestseller.

—When was ?

— was in 2000 when he was still in college.

A. that; This

B. this; It

C. it; This

D. that; It

答案：

A. that; This

B. this; It

C. it; This

(答案→)D. that; It

解析：句意：第一个人，他的第一本书出版了。它被证明是很畅销的书。第二个人，那是什么时候的事？第一个人，那是在2000年，他还在读大学的时候。第一个空，用that替代名词，用以替代前面所说的单词、短语、从句，以避免重复；第二个空，用来指代前文中的内容，用it，选D。