Before examination our teacher always asked us to _____ what we have learned. [ ]

A. go back

B. go through

C. go off

D. go over

班主任在培养学生的良好习惯时，既要言传更要身教。这句话体现了班主任德育工作的哪种意识？（）

A.责任意识

B.激励意识

C.规范意识

D.示范意识