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高中英语语法新体验——从经典例句开始
1.16.4.4 4.由because引导的表语从句

4.由because引导的表语从句

In school I did well in maths and science.I believe that is because I was interested in them and I asked a lot of questions.(人教大纲版高一下第99页)

在学校我的数学和理科成绩很好。我想这是因为我对它们有兴趣,而且问了很多问题的缘故吧。