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Mike's parents are     teachers.

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So my parents do  Nor my parents do   Nor do my parents  So do my parents  
So my parents do    Nor my parents do    Nor do my parents    So do my parents  
The parents as well as their child   Not the parents but their child   Neither the child nor his parents   Both the parents and their child  
do your parents come   does your parents come   have your parents   our parents come  
Ⅰ和Ⅱ  Ⅰ和Ⅲ  Ⅱ和Ⅲ  Ⅰ、Ⅱ和Ⅲ 第(39)至(41)题,基于“学生—选课-课程”数据库中如下三个关系: S(S#,SNAME,SEX,AG,SC(S#,C#,GRAD  ,C(C#,CNAME,TEACHE  
So my parents do    Nor my parents do    Nor do my parents    So do my parents  
The parents as well as their child   Not the parents but their child   Neither the child nor his parents   Both the parents and their child  
The parents as well as their child   Not the parents but their child   Neither the child nor his parents   Both the parents and their child  
John as well as his parents  John’s parents as well as John   John and his parents  John’s parents and John  
So my parents do   Nor my parents do   Nor do my parents   So do my parents  
(S#,C#)  (S#,GRADE)  (C#,GRADE)  GRADE  
parent’s    parents’    parents    parents’s  
向关系SC插入元组时,S#和C#都不能是空值(NUL  可以任意删除关系SC中的元组  向任何一个关系插入元组时,必须保证关系主码值的唯一性  可以任意删除关系C中的元组  
parent  parents  parents'  parents's  
care the parents   the parents do care   the parents care   do the parents care  
只有S,SC  只有SC,C  只有S,C  S,SC,C  
it;whom   himself;who   this;whom   that;who  
their parents; they aren't  their parents; aren't   his parents; they are  their parents; their aren't  

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