Do you know the boy under the tree is playing with a dog/A. which B. as C. who D. what

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【题目】Do you know the boy under the tree_______ is playing with a dog/

A. which B. as C. who D. what

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【答案】C

【解析】

试题分析：考查定语从句；句意：你知道在树下玩狗的那个小男孩吗？the boy是先行词，____ is playing with a dog/定语从句，缺少主语，用who/that，故选C项。