I want to know __________. [ ]

A. where does our teacher come from

B. where our teacher come from

C. where our teacher comes from

D. where does our teacher come

改革开放以来，我国人口特别是农村劳动力出现了以（）为主导、以（）型迁移为主要形式的规模空前的流动。

A.市场；发展

B.政策；发展

C.市场；政策

D.发展；政策