Don’t you just adore ___________ in a ho

I wonder ______ you were doing last night.

A．it was what that

B．what was it that

C．that what it was

D．what it was that

简述钻柱的功用。

污水处理技术。

妇产科最早独立分科于（）

A.汉代

B.唐代

C.宋代

D.元代

E.明代