The reason is that/because...?

The reason Why Americans celebrate Thanksgiving nowadays is that the Pilgrims were grateful for the Indians' kind help in harsh winter.想請問像這樣的句子the reason for N~/why 子句 is that ....中的that 可以用because 嗎?(正式考試中)有本字典寫 用because的說法是it's bad in English. 我記得以前有老師強調說要用that才對~可是Cobulid字典中還是有用beca...
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