Ihaveheardbothteachersandstudents_______wellofhim.A)tospeakB)spokenC)tohavespokenD)speak

I have heard both teachers and students _______ well of him.

   A) to speak     B) spoken     C) to have spoken                D) speak

 


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假定学生Students和教师Teachers关系模式如下所示: Students(学号,姓名,性别,类别,身份证号) Teachers(教师号,姓名,性别,身份证号,工资) a.查询在读研究生教师的平均工资、最高与最低工资之间差值的SQL语句如下: SELECT ( ) FROM Students,Teachers WHERE( );b.查询既是研究生,又是女性,且工资大于等于3500元的教师的身份证号和姓名的SQL语句如下: (SELECT 身份证号,姓名 FROM Students WHERE( )) ( ) (SELECT身份证号,姓名 FROM Teachers WHERE( ))A.AVG(工资) AS 平均工资,MAX(工资)-MIN(工资) AS差值 B.平均工资 AS AVG(工资),差值 AS MAX(工资)-MIN(工资) C.AVG(工资) ANY 平均工资,MAX(工资)-MIN(工资) ANY 差值 D.平均工资 ANY AVG(工资),差值 ANY MAX(工资)-MIN(工资) A.Students.身份证号 = Teachers.身份证号 B.Students.类别 =研究生 C.Students.身份证号 = Teachers.身份证号 AND Students.类别 =研究生 D.Students.身份证号 = Teachers.身份证号 OR Students.类别 =研究生 A.工资=3500 B.工资=3500 C.性别=女 AND 类别=研究生 D.性别=女 AND 类别=研究生 A.EXPERT B.INTERSECT C.UNION D.UNIONALL A.工资=3500 B.工资=3500 C.性别=女 AND 类别=研究生 D.性别=女 AND 类别=研究生

假定学生Students和教师Teachers关系模式如下所示:Students(学号,姓名,性别,类别,身份证号)Teachers(教师号,姓名,性别,身份证号,工资)a.查询在读研究生教师的平均工资、最高与最低工资之间差值的SQL语句如下:SELECT( )FROM Students,TeachersWHERE(请作答此空);b.查询既是研究生,又是女性,且工资大于等于3500元的教师的身份证号和姓名的SQL语句如下:(SELECT身份证号,姓名FROM StudentsWHERE( ))( )(SELECT身份证号,姓名FROM TeachersWHERE( ));A.Students.身份证号=Teachers.身份证号B.Students.类别='研究生'C.Students.身份证号=Teachers.身份证号AND Students.类别='研究生'D.Students.身份证号=Teachers.身份证号OR Students.类别='研究生'