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

分析 今天我帮妈妈买了一些牛肉和三个土豆做晚餐.

解答 答案:potatoes.
根据本句句意"今天我帮妈妈买了一些牛肉和三个土豆做晚餐."设空处的名词放在数词three后面且是可数名词,所以用复数形式,potato的复数形式是在后面加-es,故答案为:potatoes

点评 做此类题型的关键是通读句子,在把握句子的整体意思的前提下,根据相关语法知识把所给单词在形式上做出相应的改变.

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