题目

Claude didn’t do much homework, ________ he still passed the exam.    A. for                            B. or                     C. and                D. but 答案：D2．已知正方形ABCD的边长为12，动点M（不在平面ABCD内）满足MA⊥MB，则三棱锥A-BCM的体积的取值范围为（0，144]．