She saw the Great Wall _____the first time.A.in B.at C.by D.for

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• She saw the Great Wall _____the first time.A.in B.at C.by D.for
• She has never been to the Great Wall before.Today she saw it ___ the first time.A.at B.for C.in D.She has never been to the Great Wall before.Today she saw it ___ the first time.A.at B.for C.in D.by答案是选B,但我想知道A为什么不对.还有就是这四个选项中的短语都成立吗,如果成立的话该怎么用呢?请分别说明,
• She has never been to the Great Wall before.Today she saw it ___ the first time.A.at B.for C.in D.
• She saw the Great Wall _____the first time.A.in B.at C.by D.for
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