they couldn't find a house to live in.为什么还要加in
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theycouldn''tfindahousetolivein.为什么还要加intheycouldn''tfindahousetolivein.为什么还要加intheycouldn''tfindahouse
they couldn't find a house to live in.为什么还要加in
they couldn't find a house to live in.为什么还要加in
they couldn't find a house to live in.为什么还要加in
因为句子后面省略了house,live in house,因前面有个house重复了.