There______great changes in our hometown over the past 15 years.A.has beenB.have beenC.wasD.were

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There______great changes in our hometown over the past 15 years.A.has beenB.have beenC.wasD.were
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There______great changes in our hometown over the past 15 years.A.has beenB.have beenC.wasD.were
There______great changes in our hometown over the past 15 years.A.has beenB.have beenC.wasD.were

There______great changes in our hometown over the past 15 years.A.has beenB.have beenC.wasD.were
B.have been
changes是复数,over+时间段 又是完成时态的典型时间状语,所以选B

has been

have been.