_________ is known to all，good friends _________ happiness and value to life.?

　 A. It； add 　 B. As； add C. It； add up 　 D. As； add to

B


解析:

as引導的定語從句修飾整個主句； add to sth."使增加,使增強"； add sth to sth. "把……加到……里邊"； add up to"總計是……"。因句中已有介詞to,所以只能選B。

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