叽叽叽叽叽叽叽叽叽叽叽叽叽叽
叽叽叽叽叽叽叽取BE中点设为G,AE中点设为H,A'B'中点设为K,连接FGH,连接C'K.由题意可知面FGH∥A'B'C'(需简证)可得C'K∥FG,又∵FG在面BEF内,∴K点即为M点,C'M∥面BEF.