there is about three pages missing.这句用there is 对么?为什么不说there are

问题描述:

there is about three pages missing.这句用there is 对么?为什么不说there are

这就话的意思应该是“有大约3页失踪”,在这里,失踪相当于一个名词,three pages 都是为了修饰他的,所以应该用there is