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【多选题】
数据库的数据模型由（）组成。A.
数据操作
B.
数据长度
C.
数据类型
D.
数据结构
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【单选题】—Do you know _____ now? —Yes, in the People's Hospital. [ ]
A.
where is John working
B.
where did John work
C.
where John is working
D.
where John worked
【简答题】( ) 1. John is in the cinema now. ( ) 2. John wants to buy things with the coupons. ( ) 3. The coupons can be used at any one of the company’s stores in town. ( ) 4. There aren’t any such stor...
【单选题】-Where John?一In the library. He there for an hour.
A.
has been, has gone
B.
is, has been
C.
was, went
D.
had been, went
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