IELTS 数据-Gbase-Database-索引覆盖查询可避免回表操作，提升性能。 Practice Tests
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Total questions: 14
- 5- YES-NO-NOT GIVEN
- 4- Sentence Completion
- 5- Summary, form completion
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Total questions: 10
- 10- Sentence Completion
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Total questions: 5
- 5- Sentence Completion
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