Trắc nghiệm Chuyên đề 5: Writing có đáp án (Phần 2)
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These drugs have been withdrawn from sale.(they are used to treat stomach ulcers) →

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These drugs have been withdrawn from sale.(they are used to treat stomach ulcers)

      →_________________________________________________________________

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Giải thích

These drugs, which are used to treat stomach ulcers, have been withdrawn from sale.