the reason is that 是由that 引导的表语从句,that位于be动词之后,也做引导词,不能省略.例：The reason is that he has had a headeache.(原因是他头痛.）
is后不可以接副词或是副词性从句,because引导的是原因状语从句,所以应该是the reason is that.
the reason is because意思是:原因是.
The reason is that意思是: 理由是.
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