Although he was in a fierce fighting, he returned home .
A. connected; safe
B. cautious; safely
C. involved; safely
D. involved; safe
网友回答
A. connected; safe
B. cautious; safely
C. involved; safely
(答案→)D. involved; safe
解析：考查固定搭配和形容词。be connected with与......有关联；be cautious about小心......；be involved in牵涉，卷入......。根据句中的in排除A、B；safe在此意为“平平安安的，安然无恙的”，常与sound构成短语safe and sound。故选D。