问题
选择题
—What is she __________ for vacation?
—She __________ her little sister. [ ]
A. doing; babysitting
B. do; babysitting
C. doing; is babysitting
D. doing; babysit
答案
答案：C
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—What is she __________ for vacation?
—She __________ her little sister. [ ]
A. doing; babysitting
B. do; babysitting
C. doing; is babysitting
D. doing; babysit
答案：C