Teachersconstantlyreflectonwhattheydoasateacherandhowtheirlearnerslearnaslearners.Withsystematicreflectionsandresearch,theyimprovetheirteachingandtheirlearners'learning.Heretheteacherisplayingtheroleofa(an)__________.
A.controller
B.assessor
C.researcher
D.participant
正确答案是C