gerat changes have ___ ___(发生）in Beijing.

gerat changes have ___ ___(发生）in Beijing. gerat changes have taken p;ace in our dass recently You could have been gerat,I could have been love you 英译汉:it is gerat fun to have sports aftera day's study it was gerat fun ( ) a pinic on the hill.A to have B of having选哪个,为什么? Great changes have taken place since liberation Great changes have taken place there. have changes to make friends是什么意思 What will the changes have怎么改 We have enough money to make changes. Hardware changes might not have been detected Many changes have taken place since 1.Great changes _ _ _in China in recent years(发生）2.We should _ _ _to control the population（采取一些措施）3._of the students_ girls in our classA.One fifth;are B.One fifth;is C.First fifth;are4.-I have ever been to Beijing.- _A.So have 中间填什么：monkey king has _ changes. we should know the changes _ the numbers There have been great changes in computers(同义句）Great changes have __ __in computers there have been great changes为什么用have been Great changes have taken place in my hometown since 1930.请问句子中的Great changes是什么意思?