Question

__________ , 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

Answer 1

C

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。