应该是is,因为你应该把three hours 当成一个整体,是一个时间段,所以应该把它看成单数名词.
比如It is a long time since I saw you last time.
但是There are three hours left.就应该用复数了
应该是is,因为你应该把three hours 当成一个整体,是一个时间段,所以应该把它看成单数名词.
比如It is a long time since I saw you last time.
但是There are three hours left.就应该用复数了