【问】 More than one person_________(is，are) involved in this case.

不知应当选is，还是应当选are?

【答】 more than one后面跟的是单数名词，因此谓语动词要用单数，尽管在概念上它具有复数意义。这就是说，在这里遵循的是语法一致原则，而不是概念一致原则。

1. More than one person has been concerned in this.

这里涉及的不止是一个人。

2. There is more than one possible explanation.

可能的解释不止一个。

3. More than one member has protested against the proposal. (CGEL)

不止一个成员反对这个建议。

但是，more+复数名词+than one结构则需要与复数动词连用：

More persons than one have been involved.

涉及的不仅仅是一个人。