Why did you buy so many books?

你怎么买了这么多书？

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今天的几个句子是有打折的：

1.There's a 35% discount on all books. 全场书打六五折。

2.So that's why you bought so many. 所以你就买了这么多。

3.Pick out any one you like. 你随便挑吧。