这句话加不加s

问题描述:

这句话加不加s
The man can choose one of the girls who still keep their light up.
里面keep加不加s,their要不要改成her?

keep不用加s,their也不用改成her.因为先行词girls是复数,从句中谓语也用复数,所以不加s.
保证准确率~