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10．She had never been to the Great Wall before．Today she saw it ________ the first time．（　　）

A．

B．

C．

for

D．

分析翻譯：她以前從來沒有去過長城．今天是她第一次看到它．

解答答案：C．at the first time 是介詞短語，是"在第一次"，強調順序，for the first time 是第一次，是個副詞短語，在句子中做狀語，強調的是首次．in the first time沒有這個用法，by the first嚴格來說不存在；由于她從來沒有去過長城，所以是第一次，在句子中做狀語，故選C．

點評英語中有很多介詞短語，我們掌握它們的搭配，明確它們的含義，就能輕松應對．

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