Mr.White has warned his son to be careful __ the danger,but his son didn't listen to him.a.of b.on c.with d.for这个选啥啊?还有为什么啊～
问题描述：
Mr.White has warned his son to be careful __ the danger,but his son didn't listen to him.
a.of b.on c.with d.for
这个选啥啊?还有为什么啊～
答
be careful of=be careful about 小心 对什么谨慎 注意 表示注意自己健康等的方面 注意做到什么
be careful with=be careful in 嘱咐别人小心做事 是要注意别让某东西毁坏 或者让某物或某事伤害到自己
但是Be careful of强调对...认真，细心，小心（比较褒义）
所以选 with
答
of.
to be careful of sth是固定短语--当心,注意的意思
句子的意思：怀特先生警告他的儿子要注意危险,可他儿子不听.