There ______ great changes in our hometown in the past fifteen years.
A．has beenB．have beenC．wasD．were
B
考查時(shí)態(tài)。in the past +時(shí)間段，后用現(xiàn)在完成時(shí)態(tài)，根據(jù)題中的in the past fifteen years是現(xiàn)在完成的標(biāo)志詞之一，所以選B。
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