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单选题
What is true regarding subqueries?（）
A
The inner query always sorts the results of the outer query.
B
The outer query always sorts the results of the inner query.
C
The outer query must return a value to the inner query.
D
The inner query returns a value to the outer query.
E
The inner query must always return a value or the outer query will give an error.
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AB
BC
CD
D
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