题目

        finished my homework，I asked my brother interrupt me. A.Having never; not to                    B.Having not; to not C.Not having; to not                   D.Not having; not to   答案：D非谓语动词的否定式为“not+非谓语动词”，故只能选D。  下列毛细血管网中，起始端和终止端均流动着动脉血的是：A.脑部毛细血管B.肺部毛细血管C.肾小球毛细血管D.肠壁毛细血管