is known to all.good friends happiness and value to life.?A.It, addB.As, addC.It
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_________ 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
试题答案
B
解析: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。