问题
选择题
_____ is known to all is that good friends _____ happiness and value to life.[ ]
A. What; add to
B. It; add
C. What; add
D. It; add to
答案
答案：C
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_____ is known to all is that good friends _____ happiness and value to life.[ ]
A. What; add to
B. It; add
C. What; add
D. It; add to
答案：C