We saw farms which were built more than a hundred years ago.A. abandonedB. abandonC. aband

问题补充：

We saw farms which were built more than a hundred years ago.

A. abandoned

B. abandon

C. abandoning

D. to abandon

答案：

(答案→)A. abandoned

B. abandon

C. abandoning

D. to abandon

解析：本题中abandon的过去分词abandoned修饰名词farm表示被动的意思，意思为被放弃的农场，故本题选A。