问题描述：
Like many cities in our country ,shenzhen has __ great changes in the past twenty years.
Like many cities in our country ,shenzhen has __ great changes in the past twenty years.
A.seen B.watched C.observed D.noticted
请说明理由,
Like many cities in our country ,shenzhen has __ great changes in the past twenty years.
A.seen B.watched C.observed D.noticted
请说明理由,
问题解答：
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