_______ the exact time departure time, he missed his train.

A．Being not told

B．Having not been told

C．Not having told

D．Not having been told

抽样调查的是()。

A.根据样本资料推断总体指标

B.是专门组织的一次性全面调查

C.节省人力、物力和时间

D.按随机原则从调查对象总体中抽选样本单位