◎ 题干
When did your sister start __________ English?        
[     ]
A. to  study
B. study
C. studies
D. studied
◎ 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“When did your sister start __________ English?[ ]A. to study B. study C. studies D. studied…”主要考查了你对  【不定式】  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。