What are the childern talking about ______(do) during the summer holiday动词填空

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What are the childern talking about ______(do) during the summer holiday动词填空

doing,about是介词,介词后跟动名词

doing;
talk about sth./ sb / doing sth.
about此时是个介词,介词后面可以跟名词,代词或者动名词doing,它们统称为介词的宾语。