_________ is known to all，good friends _________ happiness and value to life.<br />A. It; add <br>B. As; add<br>C. It; add up <br>D. As; add to

_________ 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

出自：国家开放大学英语语法

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