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He spends about half an hour p_______ speaking English with

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He spends about half an hour p_______ speaking English with his foreign teacher every day.
practicing 或者practising前者多作名词,但是也有作动词.后者只能作动词.从spend time;money (in) doing sth这个句型上来看,括号中应填写DOING,从括号后的单词是DOING来看,又知practice doing sth所以填写practicing .