9904 - Part D (Page 163) Test:7 - “You could have done more than you did to help her wash the car.” means:

“You could have done more than you did to help her wash the car.”
means:
You didn’t help her at all.
You helped more than she wanted you to.
You helped as much as you could.
You helped her but not much.
Intermediate Grammar Exercises
English Modals Tests
Upper-Intermediate Grammar Exercises
Advanced Grammar Exercises