问题描述：
He bought 3 ＿＿ A.kilos apple B.kilos apples C
He bought 3 ＿＿ A.kilos apple B.kilos apples C.kilos of apple D.kilos of apples 为什么选B呢?
He bought 3 ＿＿ A.kilos apple B.kilos apples C.kilos of apple D.kilos of apples 为什么选B呢?
问题解答：
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