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After we had travelled for about 20 miles,there was still no

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After we had travelled for about 20 miles,there was still no sign of the town
travel 是固定词组吗?
After we had travelled for about 20 miles,there was still no
travel for 不是固定词组.此句分析如下:
after 引导时间状语从句,从句中用了过去完成时 had done,表示句中动作发生了一段时间,介词用for,后加一段时间.另外一种情况是,动作从什么时候开始发生,用since.这是完成时中两种时间状语的固定连接词,for 和 since.
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再问: 这里的for后面是距离而不是时间哦