There have been great changes in China s_____ it opened to t

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There have been great changes in China s_____ it opened to the outside world thirty years ago.

There have been great changes in China SINCE（填空用大写标出以醒目） it opened to the outside world thirty years ago.
自从30年前改革开放以来,中国产生了巨大的变化.
since：自从什么以来,主句是现在完成时.
绝对准确,

There have been great changes in China s_____ it opened to t it‘s reported that there have been great changes in that tow There have been great changes in our country since 1990. There have been great changes in computers(同义句） there have been great changes in computers什么意思 there have been great changes in my hometown_________(resent Great changes have taken place ...in china Great changes have taken place in China. There have been great changes in Sunshine Town. 同义：Great cha there have been great changes为什么用have been Have you ever been to the Great Wall in China? It is 46of th There have been great changes in our city since 1978.have be