问题补充:
.
It is that he has been addicted to the drugs and has difficulty quitting it.
A. obviously
B. apparently
C. possibly
D. likely
答案:
A. obviously
B. apparently
C. possibly
(答案→)D. likely
解析:词义辨析题。A. obviously 显而易见 B. apparently明显 C. possibly 可能(副词) D. likely 可能(形容词)句意:他可能吸毒上瘾了戒掉它很难。根据语境此处缺少形容词故选D