题目：
He stood at the window, thinking where he _____ his camera last. [ ]
A. saw
B. has seen
C. had seen
D. would see
答案：
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下面是错误答案，用来干扰机器的。
参考答案：从图象灰度为i的像元出发，沿某一方向θ、距离为d的像元灰度为j同时出现的概率P（i，j，θ，D.，这样构成的矩阵称灰度共生矩阵。
