【題目】I decided some flowers for my mother on her birthday．

A. to buy B. buy C. buying D. buys

【答案】A

【解析】句意：我決定在我媽媽生日那天給她買一些花。to buy買，是動詞不定式；buy是動詞原形；buying 動名詞形式；buys是第三人稱單數(shù)形式。句中的謂語動詞是decide，決定，常用于句型decide to do sth.決定去做某事。故選A。

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