题目：
The calculation of the income recognized in the third year of a five-year construction contract accounted for using the percentage-of-completion method includes the ratio of:（）
A. costs incurred in year 3 to total estimated costs.
B. total costs incurred to date to total billings to date.
C. total costs incurred to total estimated cost.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：错
