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【单选题】
若要求查找选修“数据库技术”这门课程的学生姓名和成绩，将使用关系( )。 在查找的数据库“学生-选课-课程”中存在的3个关系为： S(S#，SNAME，SEX，AGE)， SC(S#，C#，GRADE)， C(C#，CNAME，TEACHER)A.
S，SC
B.
SC，C
C.
S，C
D.
S，SC，C
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举一反三
【单选题】Miss Gao isn’t here . She _______ to the station to meet Mr. Brown .
A.
went
B.
has gone
C.
has been
D.
would go
【单选题】Miss Gao isn’t here. She _____ to the bus station to meet Mr. Brown.
A.
go
B.
has gone
C.
has been
D.
would go
【单选题】— May I speak to Mr. Brown? — Sorry, he isn't in. He ______ Shanghai. [ ]
A.
has been to
B.
was going to
C.
went to
D.
has gone to
【单选题】Mr Gao isn't here, she _______ to the bus station to meet Mr. Brown. [ ]
A.
go
B.
would go
C.
has gone
D.
has been
【单选题】— Could I speak to Mr. Brown? — ____ I'll go and see if he is in. [ ]
A.
Who are you?
B.
He isn't here.
C.
I'm sorry.
D.
Hold on, please.
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