问题
选择题
—What are you doing for vacation?
—I'm ______ my sister. [ ]
A. babysiting
B. babysit
C. babysitting
D. babysat
答案
答案：C
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—What are you doing for vacation?
—I'm ______ my sister. [ ]
A. babysiting
B. babysit
C. babysitting
D. babysat
答案：C