The journey around the world took the old sailor nine months, _______ the sailing time was 226 days. A. of which B. during which C. from which D. for which
念天地之悠悠，________________。《登幽州台歌》。
（2019·宿迁）阅读下面的文言文，完成题目。 黄忠字汉升，南阳人也。荆州牧刘表以为作中郎将，与表从子磐共守长沙攸县。及曹公克荆州，假①行裨
Planning ahead so far ______no sense—so many things will have changed by next year. A. makes B. made C. is making D. ha
艾滋病是一种严重威胁人类健康的传染病，它的三个主要传播途径包括 、 和 。
动物体内甲种氨基酸通过转氨基作用生成乙种氨基酸，可以肯定的是( ) A．甲种氨基酸是必需氧某酸 B．甲种氨基酸是非必需氨基
Elise remembers many things exactly as if it ______ yesterday. A．was happening B．happens C．has happened D．happened
