Great changes __ place and many schools ____.A、have taken ；have been opened 为什麼选择A,这句翻译

There have been great changes in computers(同义句）Great changes have __ __in computers great changes Great changes China has changed greatly in recent years.(改为同义句） Great changes have __ __ in China __. Great changes __(take) place in Jiangsu in the past 30 years 动词填空 great changes in China GREAT CHANGES HEVETAKENPIACENICHAINITHELASTFEWYEAR翻译 there()great changes in Jiangsu great cutural changes什么意思 Great changes have taken place in the city __ I visited 10 years ago.A.whereB.whichC.whoD.why答案是B为什么不是A呢 Great changes __ place and many schools ____.A、have taken ；have been opened 为什麼选择A,这句翻译 英语作文：Great Changes in My Hometown Great changes have taken place since liberation Great changes have taken place there. Great changes in my homtown 英语作文、 英语翻译Great changes —---- ------ young people------ ----- Great changes has been 的同义词 Like many cities in our country ,shenzhen has __ great changes in the past twenty years.Like many cities in our country ,shenzhen has __ great changes in the past twenty years.A.seen B.watched C.observed D.noticted请说明理由,