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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!");
【正确答案】：B