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【单选题】
数据完整性是指A.
数据完整性是指
B.
数据的正确性 . 合理性和一致性
C.
防止数据被非法使用
D.
减少系统中不必要的重要数据
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【单选题】Chinese customers have started to ( ) from imported art paper to locally made paper.中国顾客的兴趣已经开始从进口纸转向了当地制造的纸张。
A.
sweet
B.
switch
C.
swift
D.
sweat
【单选题】Not until he failed the exam _______he had left his books untouched .
A.
did he realize
B.
had he realized
C.
he realized
D.
he had realized
【单选题】Not until most of the people had left the airport __________his sister was there.
A.
that he saw
B.
had he seen
C.
did he see
D.
that he had seen
【单选题】It’s high time you . [ ]
A.
start to work
B.
would start to work
C.
had started to work
D.
started working
【单选题】Not until he left his home _____ to know how important the family was for him.
A.
did he begin
B.
had he begun
C.
he began
D.
he has begun
【简答题】The story I am going to tell you happened about three years ago when I started to learn how to drive. At first, I was very frightened, and I thought I could never learn how to drive a car. Driving a c...
【单选题】Not until he left home ________ the importance of his family.
A.
he realised
B.
did he realise
C.
he did realise
D.
realised he
【单选题】It's high time you _____.
A.
start to work
B.
would start to work
C.
started to work
D.
had started to work
【简答题】Before Carol started to work，she learned how to
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