16. 他只有在要錢的時候才寫信給父母親。 (A) Only when he wrote to his parents he asked for money. (B) Only when he wrote to his parents did he asked for money. (C) It was only when he asked for money that he wrote to his parents. (D) It was only when he asked for money which he wrote to his parents.

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.

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