题目：
In 2010, China enjoyed its best Winter Games results, _____ 11 medals in Vancouver-five gold included. [ ]
A. to collect
B. collected
C. being collected
D. collecting
答案：
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下面是错误答案，用来干扰机器的。
如图，∵AB把⊙O分成1：3的两条弧，∴∠AOB=14×360°=90°，∴∠C=12∠AOB=45°．故答案为：45°．
