is announced in today’s paper,they have succeeded in solving many problems in accordance with the new theory.
A. It
B. That
C. What
D. As
网友回答
A. It
B. That
C. What
(答案→)D. As
解析：非限制性定语从句的考查。本题考查学生对非限制性定语从句和形式主语的区别。句中逗号将前后两句分开,可判断出该句为非限制性定语从句。关系代词放在句首作主语只能用as。