题干
He _______ it for two hours, and he's still watching now.
A：has been watched
B：watching
C：has been watching
D：is watching
答案(点此获取答案解析）
C
He _______ it for two hours, and he's still watching now.
A：has been watched
B：watching
C：has been watching
D：is watching
CO(g)+H2(g)；△H>0达到平衡，下列叙述正确的是（ ）