问题描述：
将下列英语句子改为复数句,
1.This is a cup
2.Is that an orange?
3.Is the boy your friend?
4.That is Alan‘s jacket.
5.It is a ruler
1.This is a cup
2.Is that an orange?
3.Is the boy your friend?
4.That is Alan‘s jacket.
5.It is a ruler
问题解答：
我来补答展开全文阅读