this是主语.在没有上下文的情况下,this可能指一件事.为什么事实证明这（件事）很难?
prove凡是用主动语态,都表示水落石出的事实,不需人为证明.或者已成既定事实.
Why has this proved difficult? 主语是? this 是什么?difficult?
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