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单项选择题 You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously. IAsyncResult ar = cmd.BeginExecuteReader（　）; You need to execute a method named DoWork（　） that takes one second to run while the SQL query is executing.DoWork（　） must run as many times as possible while the SQL query is executing. Which code segment should you use?（）

A、

B、

C、

D、

  • B

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