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【单选题】
对外开放的 “窗口”城市指( )A.
广州
B.
深圳
C.
上海
D.
海南
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【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】若对一个具有一对多关联的表“实施参照完整性”，并且“级联更新相关字段”，则（ ）
A.
在子表中更改子关键字的值，将同时更新主表中所有相关记录的匹配值
B.
在主表和子表中同时更新关键字的值，将同时更新所有相关记录的匹配值
C.
在主表或子表中更新关键字的值，将更新所有相关记录的匹配值
D.
在主表中更改主关键字的值，将同时更新子表中所有相关记录的匹配值
【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
【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 had begun
【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】Not until he left home ______ to know _______ important the family was for him.
A.
did he begin; what
B.
had he begin; how
C.
did he begin; how
D.
had he begin; what
【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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