摘要: It was my sister who first had the idea to cycle along the Mekong River from where it begins to where it ends. 首先想要沿湄公河从源头到终点骑车旅行的是我的姐姐. It was - who - 是个强调句式.用来强调句子中的各种成分.以引起听者的注意.如果不用强调句式.以上例句可改为 My sister first had the idea - .

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