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

A. to do
B. doing
C. do
D. did
B
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科目：初中英語 來源：同步題 題型：單選題

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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