◎ 题干
—Look! The tree is growing well. When _____?            
—Three years ago.  
[     ]
A. was it planted
B. did it plant
C. will it be planted
D. is it planted
◎ 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“—Look! The tree is growing well. When _____?—Three years ago.[ ]A. was it plantedB. did it plant C. will it be plantedD. is it planted…”主要考查了你对  【人称代词】【被动语态】【一般过去时】  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。