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survey(调查) about the activity Helping the Homeless Children was made in Lucy and Lily's class. They and their 48 classmates took an active part in this activity. According to the form below, _____ students gave away school things. 
A. 24 15 2
have conducted were conducting have been conducting conducted
survey(调查) about the activity Helping the Homeless Children was made in Lucy and Lily's class. They and their 48 classmates took an active part in this activity. According to the form below, _____ students gave away school things. 
A. 24 15 2
conducting having been conducted conducted to be conducted
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