单选题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 Do Work（ ） 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? （）Awhile（ar.AsyncWaitHandle==null）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；Bwhile（!ar.IsCompleted）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；Cwhile（Thread.CurrentThread.ThreadState==ThreadState.Running）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；Dwhile（!ar.AsyncWaitHandle.WaitOne（））{DoWork（）；}dr=cmd.EndExecuteReader（ar）；
单选题
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 Do Work（ ） 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
while（ar.AsyncWaitHandle==null）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；
B
while（!ar.IsCompleted）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；
C
while（Thread.CurrentThread.ThreadState==ThreadState.Running）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；
D
while（!ar.AsyncWaitHandle.WaitOne（））{DoWork（）；}dr=cmd.EndExecuteReader（ar）；
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