have been doing sth and have done sth

[kwfine]

Dear teachers,

My little sister was doing something in the washroom, and when I saw her, her clothes were soaking wet.
So I asked her:
"What on earth have you done?"
Is there any different in meaning if I asked this:
"What on earth have you been doing/ were you doing?"

some time later in the same day, I went to Sue's home.
When I saw her, I said:
"I am going to ask you what you wanted to do tonight,but I can see you're to tired to do anything?"
Should I change it this way:
"I was going to ask you what you wanted to do tonight,but I can see you're to tired to do anything?"

Please help, teachers.

Thank you

Kitty.

[5jj]

Some time later in the same day, I went to Sue's home.
When I saw her, I said:
"I am going to ask you what you wanted to do tonight,but I can see you're too tired to do anything?"
Should I change it this way:
"I was going to ask you what you wanted to do tonight,but I can see you're too tired to do anything?"

Yes