题目内容：
() is not the advantage of GERT （Graphical evaluation and review techniques）as compared with PERT （project evaluation and review techniques）.
A.Allowing looping
B.Allowing for dummy tasks
C.Allowing branching
D.Allowing multiple project end results
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：