教育自产生之日起，就随着人类社会的发展而发展，我们一般把教育分为()不同的历史发展阶段。

A．三个

B．四个

C．五个

D．六个

It seemed that our nursery rhymes___ some magic because all the nights I sang them for my daughter, she would listen to them with keen pleasure．

A．must have had

B．should have had

C．could have had

D．need have had