their everyday observations didn·t support_____their teachers told them.A how B which C that Dwhat 为什么不能用that而必须用what.要求：理由充分
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their everyday observations didn·t support_____their teachers told them.A how B which C that Dwhat 为什么不能用that而必须用what.要求：理由充分
their everyday observations didn·t support_____their teachers told them.
A how B which C that Dwhat 为什么不能用that而必须用what.要求：理由充分
their everyday observations didn·t support_____their teachers told them.A how B which C that Dwhat 为什么不能用that而必须用what.要求：理由充分
这是个what引导的宾语从句,what既充当主句的成分（宾语）,又充当从句的成分（宾语）；
而that没有这个功能,一般引导定语从句,充当从句的成分,不充当主句的成分.
其实what =all that.
their teachers told them，缺少宾语补语，是把what放到前面，来领这个从句。what是从句中的句子成分，that则不能做从句中的句子成分。所以用what，而不是that。
楼主您好如果选that，那么这句话就缺少宾语了。而且这句话句意也不通！
如果用that，这么改：
their everyday observations didn·t support the thing that their teachers told them.
what充当2个成分：
their everyday observations didn·t supp...
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楼主您好如果选that，那么这句话就缺少宾语了。而且这句话句意也不通！
如果用that，这么改：
their everyday observations didn·t support the thing that their teachers told them.
what充当2个成分：
their everyday observations didn·t support what their teachers told them.
what their teachers told them在这里充当support的宾语，what还充当told的宾语（told them what），所以凡是what出现都要充当2个成分。（这不是正规语法，只能帮助你理解）
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这是个what引导的宾语从句，what既充当主句的宾语，又充当从句的宾语；what 等于名词n 加that ，所以用that 的话前面要加个名词thing .视谓语动词而定！