Ireallycan'tunderstand________about

发布时间：2020-07-09 13:13:36

I really can't understand ________ about such a serious matter．













A.you to joke












B.you joke











C.why joke











D.your joking

网友回答

D解析在动词understand之后要用动名词作宾语．your joking在此是动名词的复合结构．
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