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在C#程序中, 显示一个信息为”This is test!”,标题为“Hello”的消息框,正确的语句是( )

  • A.MessageBox("this is a test!","Hello");
  • B.MessageBox .Show("this is a test!","Hello");
  • C.MessageBox("Hello","this is a test!");
  • D.MessageBox.Show ("Hello","this is a test!");
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