The farm as well as its neighbouring hills we once spent so much time on a new look as re

问题补充：

The farm as well as its neighbouring hills we once spent so much time on a new look as recently as last year.

A. on has taken

B. has taken

C. on having taken

D. having taken

答案：

(答案→)A. on has taken

B. has taken

C. on having taken

D. having taken

解析：易错选B或C, we once spent so much time on实际作定语,on后所填是谓语动词,由as well as连接的并列的句子主语,谓语应和as well as之前的The farm保持一致,故用单数形式.