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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
眾所周知，好朋友給說增添快樂和價值。 as引導(dǎo)的定語從句修飾整個主句； add to sth."使增加,使增強(qiáng)"； 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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