（）dark clouds gathering on the horizon ,he stopped the work in hand and went home.
A、
To see
B、
Having been seeing
C、
Seeing
D、
Having to see
【正确答案】：C
【题目解析】：
他看到乌云在地平线上聚集，就停止手头的工作，回家了。He与see之间为主动关系，故用doing形式，现在分词做伴随状语。
（）dark clouds gathering on the horizon ,he stopped the work in hand and went home.
（）dark clouds gathering on the horizon ,he stopped the work in hand and went home.
To see
Having been seeing
Seeing
Having to see
他看到乌云在地平线上聚集，就停止手头的工作，回家了。He与see之间为主动关系，故用doing形式，现在分词做伴随状语。