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:考查句型:It is likely that 很可能…,likely 形容词,可能的,A、B、C为副词,意思分别为显然地、明显地、可能地。此题应用形容词,所以选D。