It is a teacher′s job to ________ that all his students should f

It is a teacher′s job to ________ that all his students should feel confident in preparing himself for the future.
A、be sure
B、sure thing
C、make sure
D、for sure
【正确答案】：C
【题目解析】：make sure that+从句，确认……,固定搭配；句意：老师的工作是让所有的学生对自己的未来有信心