问题描述：
列句：He bought a house last year.Did he buy a house last year?He didn't buy a house last year.
列句：He bought a house last year.
Did he buy a house last year?
He didn't buy a house last year.
下个句子来写：He lost his umbrella yesterday
列句：He bought a house last year.
Did he buy a house last year?
He didn't buy a house last year.
下个句子来写：He lost his umbrella yesterday
问题解答：
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