what on the trees?There are many apples.空白处填is 还是are?

问题描述:

what on the trees?There are many apples.空白处填is 还是are?
what____on the trees?

答案是 is能稍加讲解一下吗?感激不尽!不要受trees 的影响哦树上有什么?不要受’ TREES‘ 的影响哦意思是: 树上有什么?