Great changes_______in the city and lots of factories_______have taken place have been set up 为什么前面的答案不用加been 后面的要

Do you want to make any changes_______ your programme? 初中英语英语词形变化1.My sister_______(call)me as soon as she knows something about the accident.2.Great changes_______(take)place since I _________(leave)my hometown.3.My parents have been busy_________(take)care of my cousin for two weeks 1、We are _______(plan)a birthday party for my friend.2、It's important _______(use)computers.3、Since ten years ago great changes_______(happen)in China.4、Which language_______the most widely_______(speak)in the world?5、The lost boy_______(no great great great Great great Great great great Great Great Great great great grandpa意思 英语翻译great-great-grandmother还有great-grandfatherThanks! great green green great