题目内容
. _________ is known to all, good friends _________ happiness and value to life.
| A．It; add | B．As; add | C．It; add to | D．As; add to |
B
解析试题分析：考查非限制性定语从句和词组：句意：我们都知道的是，好朋友给人生带来快乐和价值。As引导非限制性定语从句，指代后面的句子，add …to…把…加到…里面，add to增加，选B。
考点：考查非限制性定语从句和词组
天天向上课时同步训练系列答案
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