You have to speak slowly in order to .
A. make you understood
B. make youself understood
C. make them understand
D. make themselves understand
网友回答
A. make you understood
(答案→)B. make youself understood
C. make them understand
D. make themselves understand
解析：make oneself understood意为:使自己让人家理解/明白; make sb. do sth.意思是: …使某人做某事,根据句意要选B.