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Although he is far abroad from his hometown,he is much ___hi

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Although he is far abroad from his hometown,he is much ___his family
A concerning about
B concerned about
c concerning with
d concerned
虽然我已经知道答案,可是并不清楚为什么,请解释一下concern的用法
concern
1.(不用被动语态)关于
2.涉及,关系到;影响到
The letter is chiefly concerned with export commodities.
这封信主要是关于出口商品的.
The news concerns your brother.
这消息与你兄弟有关.
3.使担心;使不安[H][(+about/for)]
The boy's poor health concerned his parents.
那男孩健康状况不佳,使他的父母亲忧虑.
He is concerned for her safety.
他担心她的安全.
4.使关心[H][(+about/with)]
He was very concerned about her.
他对她非常关心.
n.
1.关心的事,重要的事[C]
That's no concern of mine.
那不关我的事.
2.关系;利害关系[C][U][(+with/in)]
3.担心,挂念;关怀[U][C][(+about/for)]
Andrew expressed his concern.
安德鲁表示了他的关切.
4.公司,企业[C]
5.【口】小玩意儿;东西