◎ 题干
—Where is Sam?          
—He ________ in the river.        

A. swims  
B. are swimming
C. is swimming
D. is swiming

◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Where is Sam?—He ________ in the river.A. swims B. are swimmingC. is swimmingD. is swiming…”主要考查了你对  【现在进行时】【主谓一致】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。