问题
选择题
His brother aims to be __________ of his parents by the time he is twenty.
A．innocent
B．beneficial
C．invisible
D．independent
答案
答案：D
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。