选A
1、There be 句型
2、since 表示现在完成时
所以be就变成了 have been
There____a lot of changes here since 1990.
There____a lot of changes here since 1990.
A.have been B.have had C.will be D.are(为什么?
A.have been B.have had C.will be D.are(为什么?
英语人气：101 ℃时间：2020-04-09 08:52:59
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