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He is _____ his younger sister this evening.    

A. look at
B. look after
C. babysitting
D. babysiting
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科目:初中英语 来源:同步题 题型:单选题

He is _____ his younger sister this evening.    
[     ]
A. look at
B. look after
C. babysitting
D. babysiting

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