這里牽扯到prove的用法,你看完下面就明白了.
prove用法：
(一)可作系動詞,后接(to be)＋名詞/形容詞,構(gòu)成系表結(jié)構(gòu),意“結(jié)果是…,證明是”,沒有被動語態(tài).
The book proved (to be) interesting.
(二)作實義動詞用法.
1、prove＋n.(作賓語),意“證明某事”,如：
The scientist finally proved the fact.那位科學(xué)家最終證實了那個事實.
2、prove＋that賓語從句
The fact proved that his statement was true.
事實證明他的說法是正確的.