the reason is that... or the reason is because...?
The word reason is correctly followed by that rather than by the redundant because in sentences of the type The reason I left is that [not because] I was bored. Alternatively, simply use: I left because I was bored. Informally, however, and especially in conversation, the reason is because does occur and that is sometimes omitted altogether: The reason I left is because I was bored. The reason I left is I was bored.
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