China DOS Union

I did a test and couldn't use choice. I've copied the choice command to the boot disk directory. What other attachments are needed? Why can't it be used? The error phenomenon is that no choice can be made.

No need for other attachments, but you need to point PATH to the path of CHOICE, for example: PATH A:\

Read it ,you will get it !
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@echo off
echo welcome to do copy
echo (y):do copy
echo (n):not to do copy
choice /n /c:yn please select y,n!
if errorlevel 2 goto n
if errorlevel 1 goto y
:n
goto endl
:y
echo you will do copy..
echo (a): copy C:\windows\command\*.* D:\dos\.
echo (b): copy C:\windows\command\*.* e:\dos\.
echo (c): copy C:\windows\command\*.* f:\dos\.
choice /n /c:abc please select the motion of copy!
if errorlevel 3 goto c
if errorlevel 2 goto b
if errorlevel 1 goto a
:c
md D:\dos\.
copy C:\windows\command\*.* D:\dos\.
goto endl
:b
md e:\dos\.
copy C:\windows\command\*.* e:\dos\.
goto endl
:a
md f:\dos\.
copy C:\windows\command\*.* f:\dos\.
goto endl
:endl
echo think you use it
goto end
:end

Thanks to everyone's help, it's okay. The reason for the problem here is that it couldn't work normally in the Virtual PC virtual machine. Later, I burned it to a CD and it worked fine in actual use!
Thanks Wengier
Thanks Microng

After installing DOS 7.1 in a virtual machine, it can be used. Note that you need to partition first and set it as the primary partition