题目

下列不属于影响草原上羊群生活的生物因素的是（ ） A . 草 B . 狼 C . 野马 D . 牧羊犬 答案：D It is suggested that we should postpone _____ the meeting because the details have not beensettled.A．to holdB．holdingC．to holdingD．having holding