题目

用一个平面去截一个几何体，得到的截面是平面四边形，这个几何体不可能是（  ）     A.三棱锥            B.棱柱          C.四棱台            D.球 答案：D Mr. Jackson ______ the city quite well since he ______ in the city for a long time. 　 　 A. knows; was　　　　　　　　　　　　　　　　　　 B. has known; was　　 C. knows; has been D. has known; has been