Trắc nghiệm Chuyên đề 5: Writing có đáp án (Phần 2)
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I went to see my nephew Jimmy. I used to look after him when he was small. →

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I went to see my nephew Jimmy. I used to look after him when he was small.

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Giải thích

I went to see my nephew Jimmy who(m) I used to look after when he was small.