with her sister Mary is even more hardworking and better at her lessons.A. CompareB. To

问题补充：

with her sister, Mary is even more hardworking and better at her lessons.

A. Compare

B. To compare

C. Comparing

D. Compared

答案：

A. Compare

B. To compare

C. Comparing

(答案→)D. Compared

解析：考查非谓语动词。短语compare A with B 表示“A与B相比”此句中Mary与her sister相比，则Mary 与compare之间是动宾关系，所以用过去分词表被动。D正确。