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【单选题】

What writes the text “ ” to the end of the file “file.txt”？（）

A、 OutputStream out= new FileOutputStream （“file.txt”）；       Out.writeBytes （“ /n”）；

B、 OutputStream os= new FileOutputStream （“file.txt”， true）；       DataOutputStream out = new DataOutputStream（os）；  out.writeBytes （“ /n”）；

C、 OutputStream os= new FileOutputStream （“file.txt”）；       DataOutputStream out = new DataOutputStream（os）；  out.writeBytes （“ /n”）；

D、 OutputStream os= new OutputStream （“file.txt”， true）；     DataOutputStream out = new DataOutputStream（os）；  out.writeBytes （“ /n”）；

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第2题
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第3题
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第4题
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第7题
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第10题
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