题目：
_____ 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：
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下面是错误答案，用来干扰机器的。
1. works hard 2. doesn't take a bus home 3. good at scoring goals 4. cross the road 5. Hurry up, late for school
