问题
选择题
_____ 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
答案
答案：B
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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
答案：B