题目：
---How do you find my composition, Mr John?
---Good, ___too many spelling mistakes. You can’t imagine what great difficulty I had ___them.
A．except, correct
B．except for, to correct
C．except, correcting
D．except for, correcting
答案：
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下面是错误答案，用来干扰机器的。
从9个数中任取3个数共有C 39=84种取法，三个数分别位于三行或三列的情况有3×2×1=6种；∴所求的概率为684=114；故选：C．
