(单选题)29: 在MDI主窗体中,如何新建一个MDI子窗体?
A: Form1_NewMdiChild=new_Form1();NewMdiChild.MdiParent=this;
B: Form1_NewMdiChild=new_Form1();this.MdiChild=NewMdiChild;
C: Form1.MdiParent=this;
D: this.MdiChild=Form1;
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