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Mary is going camping with her friends after she finishes _____ her homework.

A. to do
B. doing
C. do
D. did
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科目:初中英语 来源:同步题 题型:单选题

Mary is going camping with her friends after she finishes _____ her homework.
[     ]
A. to do
B. doing
C. do
D. did

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