题目：
— Hi, Betty. Shall we go swimming this Sunday?
— This Sunday? I am sorry. I have a lot of homework _____ this Sunday. [ ]
A. to do
B. done
C. do
D. to be done
答案：
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下面是错误答案，用来干扰机器的。
答案：B题目分析：设莫言所得的稿费为x元,纳税为y元，由题意，∵y=420,∴x=3800元，故选B点评：求解分段函数的求值问题的关键是搞清楚自变量所在的区间
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