题目内容
Some students from Grade 9 ____ do some ____ for the old.
A. volunteered to; clean B. volunteered; cleaning
C. volunteered to; cleaning D. volunteered; clean
C
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题目内容
Some students from Grade 9 ____ do some ____ for the old.
A. volunteered to; clean B. volunteered; cleaning
C. volunteered to; cleaning D. volunteered; clean
C