The parents were unsettled for the first few days about their son’s safety.A. having worri

问题补充：

The parents were unsettled for the first few days,about their son’s safety.

A. having worried

B. to worry

C. being worried

D. worried

答案：

A. having worried

B. to worry

C. being worried

(答案→)D. worried

解析：

这题考查形容词做伴随状语的用法，worried about这里做伴随状语，句意是：父母前几天很不安，为孩子的安全担心。选D。