I wonder that how he learned it.这句话哪里错了?

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I wonder that how he learned it.这句话哪里错了?
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I wonder that how he learned it.这句话哪里错了?
I wonder that how he learned it.这句话哪里错了?

I wonder that how he learned it.这句话哪里错了?
显然 不该用that 一读就知道 去掉that