A. explained , to B. explained to , why C. explained to , for D. explained, for 6. charge . n 负责,掌管; 费用; v 收费 (该动词的用法请同学们查字典) in /under charge of 某人负责某事 = take charge of in the charge of 某事由某人负责 in charge 负责 掌管...