写出下列单词的单复数,不可数名词用“/"表示1.uncle 2.cousin 3.photo 4.aunt 5.family 6.actress 7.actor 8.sister 9.math

问题描述:

写出下列单词的单复数,不可数名词用“/"表示
1.uncle 2.cousin 3.photo 4.aunt 5.family 6.actress 7.actor 8.sister 9.math