What do you suppose has happened to him? 是这个句子看成一个简单句，do you suppose 作为一个插入语．还是把这个句子看成一个复合句，do you suppose 是主句？？？

What do you suppose has happened to him? 这不是一个好句子。英国人般不会这样说，应该说成 Do you suppose What has happened to him? ------sun