<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
<input type="radio" name="test" value="1" />
<input type="radio" name="test" value="2" checked="checked" />
<input type="radio" name="test" value="3" />
<script>
let radios = document.getElementsByTagName('input');
for(i = 0; i < radios.length; i++) {
radios[i].onclick = function(e) {
if(e.ctrlKey) {
this.checked = false;
}
}
}
</script>
</body>
</html>