题目内容
【题目】 (they/their) like to play pingpong. Playing pingpong is (they/their) favourite school work.
【答案】They；their
【解析】句意：他们喜欢打乒乓球。乒乓球是他们最喜欢的学校功课。like是动词，前面缺少主语，做主语用人称代词，favourite school work.是名词短语，前面用形容词性物主代词，所以答案是They，their
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