【英语卷（解析）·2015届浙江省绍兴一中高三上学期回头考试（201409）】34. A lot of language learning,________ has been discovered, is happening in the first year of life, so parents should talk much to their children during that period.
A. as B. it C. which D. this
【答案】【知识点】A15定语从句
【答案解析】A。解析：空白处所在句为非限制性定语从句，故B、D两项可排除。由句意知空格处的关系词指代a lot of language learning is happening in the first year of life这个句子。指代某个句子时，as引导的非限制性定语从句可后指或前指，而which引导的从句只能前指。这里是后指。句意：正如被发现的那样，大量的语言学习是在人生的第一年发生的，所以父母应当在那个时期和孩子多说话。
【技巧点拨】as单独引导定语从句时，修饰整个主句或主句中的一部分，可以放在句首、句中或句末。
【典型总结】常见的结构如下as is known to all 众所周知；as was expected 正如预料的那样； As is known to everybody, the moon travels round the earth once every month. 众
