there have been great changes in computers什么意思

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• 一片英语科技短文的选择here have been many great inventions, things that changed the way we live in. The first great invention was one that is still very important today一the wheel. This made it easier to carry heavy things and to travel long distances. For hundreds of years after that there were few inventions that had as much effect as the wheel. Then in the early 1800's the world started to change. There was little unknown land left in the world. People did not
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• 同义词、句 下列句子的同义句 1 Amy had a great time at Water World.Amy at Water World.2 My brother同义词、句 下列句子的同义句1 Amy had a great time at Water World.Amy at Water World.2 My brother is good at piaying footboll.My brother piaying footboll.3 Have you heard of Bali Have you Bali 4 I' ve been learning to darw since three years ago .I' ve been learning to darw .5 Could you please help me open the door?me open the door?6 There are over two hundred teachers in our school
• “There has been great changes in computers in the last few year”为什么是 has been不是have had
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• There have been great changes in computers(同义句）