unusual前用an。

unusual：

adj.特别的;不寻常的;罕见的;独特的;与众不同的;别致的

扩展资料

She behaved for all the world as if nothing unusual had happened.

看她的表现就像根本没有发生过什么大事似的。

There was something, dare I say it, a little unusual about him.

要我说呀，他这人有那么一点怪。

She's happy with her unusual living arrangements.

她对自己不同寻常的生活安排方式感到很得意。

He has an unusual cast of mind.

他的思想与众不同。