the teacher expected, the students were very excited after hearing the good news.
A. As
B. So
C. What
D. /
网友回答
(答案→)A. As
B. So
C. What
D. /
解析：本题考查定语从句。句意为：正如老师所预料的，听到这个好消息后学生们很兴奋。as引导非限制性定语从句，指代主句整个句子的内容，位置比较灵活，可以位于主句前面，中间或后面，一般用逗号与主句隔开，而 which 所引导的非限制性定语从句只能放在主句之后。