The reason why I was alone in the mountains is as I had a difficulty with my guide.

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问题 The reason why I was alone in the mountains is as I had a difficulty with my guide.

选项 A、was because
B、is because
C、was that
D、is that

答案C

解析 本题重点考查固定句型。The reason why…is that-clause是规范的固定句型,其中that不能由because来替换,如果用because,在逻辑上就显得重复。四个选项中只有C和D可选,从why引导的从句中的时态可以知道主句谓语动词也应该用过去时,故选C。
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