–There great changes in Nanjing in the past few years. –I agree. And some more lines of th

问题补充：

–There great changes in Nanjing in the past few years.

–I agree. And some more lines of the underground will be in service this year.

A. will be

B. are

C. were

D. have been

答案：

A. will be

B. are

C. were

(答案→)D. have been

解析：句意:-在过去的几年里，南京发生了很多变化。-我同意你的看法。而且今年还有几条地铁线将要投入使用。这句话中使用的句型是there be 结构，有句中的in the past few years 可知，这里应该用现在完成时，故应该选D。Ａ是将来时；B是一般现在时；C是一般过去时。