21. A historiandoes not onlydescribeevents, but tries to explain _____ occur in the firstplace.
21.一位歷史學家不僅描述事件,而是試圖解釋_____發生在首位。
(B)whatcausesthem to 他們什麼導致
21. A historian does not only describe e..-阿摩線上測驗