问题补充:
There great changes in our hometown in the past fifteen years.
A. has been
B. have been
C. was
D. were
答案:
A. has been
(答案→)B. have been
C. was
D. were
解析:在过去的十五年里我们的家乡发生了巨大的变化。根据 in the past fifteen years可知,本句应用现在完成时have/has +过去分词;由于真正的主语是great changes,故用have,所以本题选B。