The weather in Ningbo is rather cold in winter especially when that in my hometown.A. ha

问题补充：

The weather in Ningbo is rather cold in winter, especially when that in my hometown.

A. having compared to

B. comparing to

C. compare to

D. compared to

答案：

A. having compared to

B. comparing to

C. compare to

(答案→)D. compared to

解析：句意：宁波的天气在冬天是相当冷的，尤其是当与家乡的天气相比时。When后是省略句，完整的是when it is compared to that in my hometown.当从句的主语与主句的主语一致，并且从句的谓语动词有be时，这时从句的谓语动词be与主语都可省去。故选D。