They ,far from here ,you can find_____ island on which lives

They ,far from here ,you can find_____ island on which lives an old man living____
A.a lonely;alne B an alone;lonely
答案给的是A,但是island前面不是必须加an吗?
.纠结

island前面是加an,
但是在island的前面还有一个形容词,
而冠词是填a或an是由离它最近的那个单词决定的,这就是所谓的“就近原则”
“就近原则”是英语中比较重要和常见的原则之一,该原则也称“邻近原则”
关于就近原则的介绍：
【就近原则】
“就近一致原则”(Proximity）,即：谓语动词、冠词等形式与靠近的名词、代词（有时不一定是主语）在“人称、数”上一致.
I.在正式文体中：
1.由下列词语连接的并列主语："there be＋句型; or ; either …or；nor; neither…nor；whether…or；not…but; not only…but also" ; 等.e.g.
①What he does or what he says does not concern me .他的行为或言谈都与我无关.
②Neither you nor I am wrong .你和我都没错.
③Not you but your father is to blame .不是你,而是你父亲该受责备.
④Not only you but(also) he is wrong .不仅你错了,他也错了.
2.在倒装句中：谓语可与后面第一个主语一致.e.g.
①In the distance was heard the clapping of hands and the shouts of the people .在远处,能听见鼓掌声和人们的呼喊声.
②There is (are) a pen and some books on the desk .桌上有一支钢笔和几本书.
II.非正式文体中：
有时依“就近一致原则”,但也可依“意义一致原则”或严格地依“语法一致原则”.e.g.
Neither she nor I were there (意义一致) 我和他当时都不在那儿.（非正式）
Neither she nor I was there .（就近一致）（译文同上句）（正式）
但是,如果依“就近一致原则”而与其他两项原则相矛盾时,则常常认为是不太合符规范的.e.g.
No one except his own supporters agree with him .仅他自己的支持者同意他的意见.（依“就近”和“意义”一致的原则；但语法上,“No one ”才是主语,谓语要改成“agrees”.“写作中”一般要依“语法一致”原则.
【就远原则】
谓语动词与前面主语一致
代表词汇：as well as；（together/along）with；rather than；except；besides；but；including；in addition to；apart from
E.G：He rather than I is right.
Nobody but two students is in the classroom.
在英语中还有许多
有参考百科中的解释
希望对你有用