◎ 题干
I study math by ____ lots of exercises.
[     ]
A. did
B. doing
C. do
D. to do
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“I study math by ____ lots of exercises.[ ]A. did B. doing C. doD. to do…”主要考查了你对  【动名词】  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。