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查询语句中，取消重复值的关键字为（）？
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查询语句中排序语句为：
查询语句中需要对组进行筛选的语句为：
不相关子查询，执行查询的顺序是先执行父查询再执行子查询。
Choose the appropriate answer from the four choices marked A, B, C, and D.1. ______ difficult the task may be, we will try our best to complete it in time.A. No matter B. No wonder C. Though D. However2. ______ the day went on, the weather got worse.A. WithB. SinceC. WhileD. As3. Father was ______ busy in working ______ he often forgot rest or meals.A. very; thatB. so; thatC. such; asD. enough; as4. We had hardly got to the station ______ it began to rain.A. untilB. sinceC. whileD. when5. Helen listened carefully ______ she might discover exactly what she needed.A. in thatB. in order thatC. in caseD. even though6. ______ no one is against it, we will adopt the proposal.A. whileB. SinceC. ThatD. For7. It was _____ everyone went to the beach.A. so hot a weather thatB. such hot weatherC. a hot enough weather so thatD. a very hot weather so that8. I would like to go abroad ______ you do.A. as ifB. thoughC. asD. so that9. This dress is prettier, but it costs ______ that one.A. twice as many asB. as much as twiceC. as twice asD. twice as much as10. Anyone can borrow books from this library ______ he keeps them clean andreturns them in time.A. even ifB. as long asC. in order thatD. unless
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