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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