◎ 题干
The girl spends at least as much time singing as she _______.

[     ]

A. studies
B. does studying
C. is studying
D. does to study
◎ 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“The girl spends at least as much time singing as she _______. [ ]A. studies B. does studying C. is studying D. does to study …”主要考查了你对  【助动词】  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。