English is___ useful language because people in many countries are using it.
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推荐题目
The dog had _____ serious toothache so its owner took it to _____ animal doctor.
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a, /
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a, an
There will be ___________ new shopping mall in the south-east of Xinghua town this year.
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Mr. Chen is _____ generous man. He has donated a lot of money to people in need.
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--Have you seen ____Audi car I parked here?---Is it _____ black one? A young man has driven it away.
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the, the
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the, a
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an, the