问题
选择题
There ______ great changes in our hometown in the past fifteen years.
A．has been
B．have been
C．was
D．were
答案
答案：B
考查时态。in the past +时间段，后用现在完成时态，根据题中的in the past fifteen years是现在完成的标志词之一，所以选B。
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