, some students tend to develop a range of unhealthy habits .
A. Parents don’t watch over them
B. Not having watched over
C. With no parents to watch over them
D. Parents watched over
网友回答
A. Parents don’t watch over them
B. Not having watched over
(答案→)C. With no parents to watch over them
D. Parents watched over
解析：考查with复合结构。从句的逻辑主语就是主句的主语some students，A和D 都不对，逻辑主语some students 和动词watch over 是被动关系，学生是被监管，B不对
可以说Not watched over, some students tend to ……。C是with 的复合结构。