---“______is that boy?”---“He's my son.”A.WhoB.WhomC.WhatD.Which
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A
解析分析:Who is that boy?“谁”,指“人物”之间的关系,He's my son.就表示了“人物关系”。而whom是宾格,此处不能用。What is that boy?是指“职业”。Which is that boy?意思是“哪一个是(你所提到的)那个男孩?”答句可以说:The boy over there.(延伸)特殊疑问句中可以用who代替whom作句子的宾语,如:Who did you meet yesterday?