Contrast may make something appear more beautiful than it is

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Contrast may make something appear more beautiful than it is when ______ alone.
having been seen
seen
to be seen
being seen
选seen
能说明下别的几个为什么不选吗,如果选又将把句子进行什么改动,请举例,

选SEEN,是非谓语用法,过去分词表示被动.这空先看它要修饰的是那个词.是IT,--it指代前面的something.就是说,有了对比,一些事物会比被单独看来的更美.
非谓语一般就是过去分词表示被动.现在分词表示主动.Having been +V 表示过去曾经被看,这句句子是个真理啊,任何时候都适用的,不能用表示过去的.To be seen 可以表示将来要看,这里同样,任何时段都可以,不用将来.Bing seen现在正在被看.同理.
也就是说,这是个真理,任何是间都是适用的,适用用一般时态,不用过去,将来或进行时态

Contrast may make something appear more beautiful than it is Contrast may make sth appear more beautiful than it's when _ When you look ahead, it may appear you have more than you ne _____beijing today is more beautiful than it was . )is more beautiful than roses. How beautiful the town is!Yes,it is more beautiful than __ t it will make you appear more courteous.这句话对么? Make something look better or more beautiful（）猜词 Our hometown is more beautiful than before, Our hometown is more beautiful than before ---- A the small town is!----Yes,it is more beautiful than t _____ the small town is!— Yes,it is more beautiful than ____