再障肾阴虚证,治疗应首选的方剂是()。
A.左归丸合当归补血汤
B.清瘟败毒饮
C.六味地黄丸合桃红四物汤
D.八珍汤
E.左归丸、右归丸合当归补血汤
参考答案:A
—Did you meet the professor at the airport?
—No,he ____ by the time I ____ there.
A.had left;got
B.has left;reached
C.was leaving;got
D.left;had got
为什么要建立决策执行的双轨保障系统?