____ the teacher expected, the students were very excited af
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答案A

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.