Can not open output

Can not open output can not call method open of undefined Open xxx For Output As #1 you can not open the box if you do not Proteus 仿真时出现can not open "C.LISA3199.SDF 在装系统时出现 can not open image file The children can not wait _____(open) the present Do not smash the door open;I can find the Output Open "d:\temp\outf.txt" For Output As #1 10 open "YMZ.LST" FOR OUTPUT AS FILE #1 please open the window,（）?A.can not you B.are not you C.do y