对于教学数据库的三个基本表：S(Sno，Sname，Ssex)，SC(Sno，Cno，Grade)，C(Cno，Cname，Teacher)，其中S表为学生表，SC为学生选课表，C为课程表，则对于语句：检索至少选修LIU老师所授课程中一门课程的女生姓名，SQL语句错误的是______。

A．SELECT Sname FROM S，SC，C WHERE S Sno=SC.Snn AND SC.Con=C.Con And Teacher='LTU' AND Seex='F'

B．SELECT Sname FROM S WHERE Ssex='F' AND Sno IN (SELECT Sno FROM SC WHERE(Cno IN(SELECT Cno FROM C WHERE Teacher='LIU'))

C．SELECT Sname FROM S WHERE Ssex='F' AND EXISTS(SELECT* FROM SC WHEPE SC.Sno=S. Sno AND EXISTS (SELECT* FROM C WHERE Teacher='LIU'))

D．SELECT Sname FROM S WHEPE Ssex='F' AND EXISTS(SELECT* FROM SC WHERE SC.Sno=S.Sno AND EXISTS (SELECT* FROM C WHERE C Cno=SC Cno AND Teacher='LIU'))

直立式构图中第一主枝（），第二、第三主枝斜插于第一主枝侧面，构成有较强向上动势的造型。

A、侧卧

B、平插

C、直立

D、下垂