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【简答题】
【 】完整性是保证表中记录唯一的特性,通常通过定义主关键字来实现。
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举一反三
【单选题】I won’t watch the TV play if my father ________ me do my homework. [ ]
A.
let
B.
will let
C.
won’t let
D.
lets
【单选题】If my father will not agree to sign the papers,______.
A.
so I won't
B.
so will I
C.
neither I will
D.
neither will I
【单选题】— I didn’t watch the program “Where are we going, Dad?” yesterday. — I________, either, if my father hadn’t reminded me.
A.
wouldn’t
B.
didn’t
C.
wouldn’t have
D.
hadn’t
【单选题】If my father here last night, he me from going.
A.
had been;would have prevented
B.
had been;would prevent
C.
were;would
D.
were;would have prevented
【单选题】— I didn’t watch the program “Where are we going, Dad?” yesterday. — I________, either, if my father hadn’t reminded me.
A.
wouldn’t have
B.
didn’t
C.
wouldn’t
D.
hadn’t
【单选题】If my father ______ here yesterday, he would have stopped me from going surfing.
A.
had been
B.
were
C.
should be
D.
has been
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