20. 近幾年來，台灣致力於經貿外交及人道援助，舉世皆有目共睹。
(A) Over the past few years, Taiwan was dedicated itself to economic diplomacy and humanitarian aid, and its efforts had attracted much notice worldwide.
(B) Taiwan has focused on economic diplomacy and humanitarian aid over the past few years, and its efforts have attracted much notice worldwide.
(C) Taiwan had devoted itself to economic diplomacy and humanitarian aid over the past few years, and its efforts had attracted much notice worldwide.
(D) Over the past few years, Taiwan devoted to economic diplomacy and humanitarian aid, and its efforts attracted much notice worldwide.