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

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

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,

呃,楼上那位回答的很准确,望采纳。