◎ 题干
She has to stay at home because she's _____ her sister.
[     ]
A. babysit
B. babysiting
C. babysitting
◎ 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“She has to stay at home because she's _____ her sister. [ ]A. babysit B. babysitingC. babysitting …”主要考查了你对  【实义动词的现在分词】【现在进行时】  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。