题目内容：

they must do___duty,as we must do___.we have kept___promise;let them keep___.

优质解答

their,ours.our,theirs.名词性物主代词与形容词性物主代词区别如下人称代词分主格和宾格,用作主语时用主格,作宾语是用宾格.主格：I,you,he,she,it,we,they 宾格：me,you,him,her,it,us,them 【I am a teacher.My mot...