I really can't understand ________ her like that.A.you treatB.you to treatC.why treatD.you treating
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D解析解析：understand后跟doing sth./n. /wh-从句，故选you treating，是动名词的复合结构或用 why you treat也可以．命题立意：本题考查动名词的复合结构，注意此结构作宾语时前面代词可用人称代词的宾格或形容词性物主代词，作主语时只能用形容词性物主代词．