　　 of the students in our school are from the countryside.A.Two﹣three B.Two﹣third C.Two﹣thirds D.S...

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approve of students wear approve of students wearing approve of students to wear approve of students wore

3 4 6 7

student, is the students, are the students, is students, are

3 4 6 7

Grade SUM （Grade）/ 7 AVG（Grade） SUM （Grade）/ COUNT（Cno）

6 7 8 9

WHERE COUNT(Sno) WHERE COUNT (DISTINCT(Sno)) HAVING COUNT (Sno) HAVING COUNT (DISTINCT(Sno))

approve of students wearing approve students to wear approve students wearing approve of students to wear

approve of students wore approve students to wear approve of students to wear approve of students wearing

6 7 8 9

approve of students wearing approve students to wear approve students wearing approve of students to wear

hundred hundreds hundred of hundreds of

we us our ours

WHERE COUNT（Sno） WHERE COUNT（DISTINCT （Sno）） HAVING COUNT（Sno） HAVING COUNT（DISTINCT （Sno））

approve of students wore approve students to wear approve of students to wear approve of students wearing

to smoke, to smoke students’ smoking, smoking students’ to smoke, smoking students’ smoking, to smoke

when the American students visit when the American students will visit when do the American students visit when will the American students visit

student ;is the students; are the students ;is students ;are

Grade SUM(Grade)/7 AVG(Grade) SUM(Grade)/COUNT(Cno)