若使用一个表达式的含义能解释为访问多个基类中的成员，则这种对基类成员的访问就是不确定的，称这种访问具有_________。
参考答案：
--- _____ Tracy was in such a hurry ?
---I don’t know．She might have been running to catch the bus.
A．Why do you think
B．Why you think
C．Do you think why
D．Why not think
制备抹灰工程水泥混合砂浆时，块状生石灰熟化成石灰膏熟化时间不得小于（）天
A.5
B.7
C.10
D.15
