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Was it__the international conference that made the city the focus of this area?
填holding,holding the international conference 主语
to hold 表示“去举行”,动作尚未发生； holding 表示动作已经发生.
通过主句时态 谓语made可看出是过去时态,动作已经发生,所以用holding
这是强调句型“It was...that...”的一般疑问句.
普通疑问句为：
Did holding the international conference make the city the focus of this area?
强调句型的陈述句型是：
It was holding the international conference that made the city the focus of this area.
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