Question

What( )you( )(do)to my computer?It( )(work)all right a moment ago.But now it is refusing to work.

Answer 1

What(have )you( done)(do)to my computer?It( worked)(work)all right a moment ago.But now it is refusing to work.
这句话的意思是：你对我的电脑做过什么了？刚才它还能好好地工作，但现在啥也干不了啦。
这里强调的是“做过”，所以要用完成时。

Answer 2

what did you do to my computer?
it worked all right a moment ago.
but now it is refusing to work.

Answer 3

did do,was working

Answer 4

What(have )you(done )(do)to my computer?It( worked)(work)all right a moment ago.But now it is refusing to work.

Answer 5

What did you do to my computer?It worked all right a moment ago.But now it is refusing to work.