His brother aims to be of his parents by the time he is twenty.
A. innocent
B. beneficial
C. invisible
D. independent
网友回答
A. innocent
B. beneficial
C. invisible
(答案→)D. independent
解析： 词义辨析。innocent 无辜的，无罪的；beneficial有益的；invisible 看不见的；independent独立的。句意：他弟弟打算在他20岁时能够离开父母独立。所以选D。