问题
选择题
28. The farm as well as its neighboring hills we once spent so much time ____ on a new look as recently as last year.
A．on having taken
B．has taken
C．on has taken
D．having taken
答案
答案：C
考查语法结构, 但须前后兼顾。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。