20．I helped my mother to buy some beef and threepotatoes（potato）for supper today．

分析 今天我?guī)蛬寢屬I了一些牛肉和三個土豆做晚餐．

解答 答案：potatoes．
根據(jù)本句句意"今天我?guī)蛬寢屬I了一些牛肉和三個土豆做晚餐．"設(shè)空處的名詞放在數(shù)詞three后面且是可數(shù)名詞，所以用復(fù)數(shù)形式，potato的復(fù)數(shù)形式是在后面加-es，故答案為：potatoes

點評 做此類題型的關(guān)鍵是通讀句子，在把握句子的整體意思的前提下，根據(jù)相關(guān)語法知識把所給單詞在形式上做出相應(yīng)的改變．

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