There____a lot of changes in beijing in the past few years.
问题描述:
There____a lot of changes in beijing in the past few years.
答
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
答
were
答
have been
有 in the past few years用现在完成时