he asked the question that is very diffcult. 其中的that 可以用which 替换吗

问题描述:

he asked the question that is very diffcult. 其中的that 可以用which 替换吗

He asked the question that is very diffcult.
其中的that 可以用which 替换.
He asked the question that / which is very diffcult.
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