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 takenB．has takenC．on has takenD．having taken
C
考查語法結(jié)構(gòu), 但須前后兼顧。易錯選B或C, we once spent so much time on實際作定語, on后所填是謂語動詞, 由as well as連接的并列的句子主語, 謂語應和as well as之前的The farm保持一致,故用單數(shù)形式。
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