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_________ is known to all,good friends _________ happiness and value to life.?
A.It; addB.As; addC.It; add upD.As; add to
B
众所周知,好朋友给说增添快乐和价值。 as引导的定语从句修饰整个主句; add to sth."使增加,使增强"; add sth to sth. "把……加到……里边"; add up to"总计是……"。因句中已有介词to,所以只能选B。
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