Posted by Matthew on Thursday, April 19, 2012 at 2:13pm.
"had" is correct; "done" is not incorrect, but it's just not a commonly used expression.
http://www.google.com/search?rlz=1C1GGGE_enUS379US379&sourceid=chrome&ie=UTF-8&q=modal+verbs+express+degrees+of+probability
Take a look through these search results, and see if you find what you need for these modal verbs.
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