Last year, customers______(buy)a total of 90 million books from the book center．

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问题 Last year, customers______(buy)a total of 90 million books from the book center．

选项

答案 bought

解析此题考查的是动词的时态。在这句话中有明显的过去时间“last year”，所以用一般过去时。buy的过去式是bought。

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