[单选] Your application uses two threads， named threadOne and threadTwo. You need to modify the code to prevent the execution of threadOne until threadTwo completes execution. What should you do？（）

A . Configure threadOne to run at a lower priority.
B . Configure threadTwo to run at a higher priority.
C . Use a WaitCallback delegate to synchronize the threads.
D . Call the Sleep method of threadOne.
E . Call the SpinLock method of threadOne.

观察期条款 You load an XmlDocument named doc with the following XML. World Atlas Dictionary You need to use an XPath query string to select the two book nodes. Which code segment should you use? （） Dim root As XmlElement = doc.DocumentElementDim nodes As XmlNodeList = root.SelectNodes(".")。 Dim root As XmlElement = doc.DocumentElementDim nodes As XmlNodeList = root.SelectNodes("book")。 Dim root As XmlElement = doc.DocumentElementDim nodes As XmlNodeList = root.SelectNodes("bookstore//book")。 Dim root As XmlElement = doc.DocumentElementDim nodes As XmlNodeList = root.SelectNodes("books/book")。 The 0SPFv3 process will send hello packets to which of the follov/ing well-known addresses？（） 255.255.255.255。 224.0.0.6。 FFFF：FFFF：FFFF：FFFF：FFFF：FFFF：FFF：FFF。 FF02：：10。 224.0.0.10。 FF02：：5。拗体律诗叙述网络管理的功能。 Your application uses two threads， named threadOne and threadTwo. You need to modify the code to prevent the execution of threadOne until threadTwo completes execution. What should you do？（）

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[单选] Your application uses two threads， named threadOne and threadTwo. You need to modify the code to prevent the execution of threadOne until threadTwo completes execution. What should you do？（）

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