某分部工程双代号网络计划如图2-3所示,图中错误为()。
A.节点编号有误
B.工作代号重复
C.多个起点节点
D.多个终点节点
E.存在循环回路
参考答案:A, B, C, D
Jenny likes reading a newspaper ______ she is having breakfast. [ ]
A. until
B. while
C. because
D. though