some of the experiments ( )in our textbook are difficult to perform.答案给的是described,但是为什么不用be described呢?

Some of the some of 后加不加the some of the girls the names of some of the things the names of some of the things what are some of the some of the most是什么意思 pronounce some of the words the names of some of the thithe names of some of the things 翻译 some of the people 和 some people区别 some students 和 some of the student的区别 some words 和some of the words的区别 Some of the things some people,only to miss some drivers和some of the drivers的区别 we could give some of the reindeer some cookies. some of them steer by the position of the sun in some parts of the world. Some people call itthe language of