Nancy thinks __ hard to understand __ __(改为同义句 Nancy thinks Chinese history is hard to unders
问题描述：
Nancy thinks __ hard to understand __ __(改为同义句 Nancy thinks Chinese history is hard to unders
Nancy thinks __ hard to understand __ __(改为同义句）
Nancy thinks Chinese history is hard to understand.
答
Nancy thinks it或it's hard to understand Chinese history.