是one year and a half还是a year and a half?为什么?

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• It was the first time in a year and a half that I'd seen the night face to face.主句是一般过去式,从句是过去完成时 主从句所用时态不一致表示什么呢?看见夜晚比“第一次”发生的时间更前?这是一个什么从句呢?
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• when do you think it is _____ he arrived here?.-When do you think it is _____ he arrived here?-No more than half a year,I believe.A.when B.that C.before D.since请问是选D,表示“自从来了.不到半年”吗?如果不是那选什么为什么?
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