【题目】Who _______ in the river? ( )
A.swimB.is swimC.is swimmingD.swimming
【答案】C
【解析】
句意：谁在河里游泳？分析句子结构可知，此处缺少be动词，who作主语时谓语动词一般用单数，故用is，而be动词后要接动词-ing形式，be+动词-ing形式表示正在发生的事情，故排除A、B、D选项，故选C。
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