A.戰(zhàn)爭(zhēng)的非正義性質(zhì) B.美國(guó)的參戰(zhàn) C.協(xié)約國(guó)的經(jīng)濟(jì)實(shí)力更強(qiáng) D.同盟國(guó)始終兩面作戰(zhàn)