There have been great changes in China s_____ it opened to the outside world thirty years ago.
人气：221 ℃ 时间：2019-12-12 23:04:07
解答
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,
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