has been reported in the newspaper they were about to have peace talks between the two c

问题补充：

has been reported in the newspaper, they were about to have peace talks between the two countries when an accident happened.

A. It

B. As

C. That

D. What

答案：

A. It

(答案→)B. As

C. That

D. What

解析：考查定语从句。 has been reported in the newspaper是从句，it和what不能引导定从，That不能引导非限制性定从，所以选As，代指they were about to have peace talks between the two countries when an accident happened.整个句子。