因为上海举行了2010世博会，所以数百万人前往了上海。(because，the 2010 Expo)Because the 2010 Expo was held in Shangh

因为上海举行了2010世博会，所以数百万人前往了上海。(because，the 2010 Expo)
Because the 2010 Expo was held in Shanghai，millions of people went there.

(答案→)Because the 2010 Expo was held in Shanghai，millions of people went there. 解析：本题中的原因状语从句用because来引导，原因状语从句中的主语可用 the 2010 Expo，从句可使用被动句，结构为be held，本题表示的是过去的事件，故使用was held，所以从句可翻译成Because the 2010 Expo was held in Shanghai，英文中的因果关系，使用了because，就不可以使用so，表示数百万人可用millions of people，故本题的主句可翻译成millions of people went there.所以本题可翻译成Because the 2010 Expo was held in Shanghai，millions of people went there.

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