A、must have been
B、might go
C、has gone
D、had been
第1题:
A.knows...how
B.know...how
C.knows...what
D.knew...what
第2题:
The little man was _____ more than one meter fifty tall.
(A) nearly (B) quite (C) hardly D) almost
D,
B是的确,确实
C是几乎不
A虽然用有几乎的意思,但这里用almost比nearly更恰当确切一些!
第3题:
关系模式CSZ(CITY,ST,ZIP)其属性组上的函数依赖集为F={(CITY,ST)→ZIP, P→CITY},关系模式CSZ的主属性是
A.ZIP
B.CITY,ST,ZIP
C.CITY,ZIP
D.ST,ZIP
第4题:
Very few ___ his address in the town.
A、has known
B、are knowing
C、know
D、knows
第5题:
关系模式CSZ(CITY,ST,ZIP)其属性组上的函数依赖集为F={(CITY,ST)+ZIP, ZIP→CITY},关系模式CSZ的主属性是
A.ZIP
B.CITY,ST,ZIP
C.CITY,ZIP
D.ST,ZIP
第6题: