There____a lot of changes in beijing in the past few years.

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There____a lot of changes in beijing in the past few years.

There____a lot of changes in beijing in the past few years.
There____a lot of changes in beijing in the past few years.

There____a lot of changes in beijing in the past few years.
have been
有 in the past few years用现在完成时

were

have been 先看时态,,后看语态 有 in the past few years用现在完成时
和后面的changes保持一致 所以用have