摘要：11] is known to all.good friends happiness and value to life. [译文] 众所周知.好朋友给说增添快乐和价值. A. It; add B. As; add C. It; add up D. As; add to [答案及简析] B. 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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