问题描述：
英语对一个包裹提问用what is还是what are?
what is in it?
what are in it?
what is in it?和 what is this in it?有区别吗
what are in it?和 what are they in it?有区别吗
what is in it?
what are in it?
what is in it?和 what is this in it?有区别吗
what are in it?和 what are they in it?有区别吗
问题解答：
我来补答展开全文阅读