数据库系统包含了数据库及它的（）。
A.存储器
B.管理软件
C.用户
D.网络
参考答案：B
As a result of my laziness, I failed _____ my work in time. [ ]
A. and finished
B. to finish
C. and finishing
D. to finished
(2013·辽宁六校高三联考)She was told to wear flat shoes ________ her back problem.
A．on account of
B．regardless of
C．in terms of
D．in case of
