They lived in Seoul some years ago.
A. They use to lived in Seoul some years ago.
B. They used to lived in Seoul some years ago
C. They used to live in Seoul some years ago.
D. They used to lives in Seoul some years ago.

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A. who
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I use this broom …. cleaning the floor
A. for
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Choose the word that goes best with the underlined section of the sentence:
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