【单选题】

Over the last ten years, the number of people entering managerial roles (141) increased significantly. Managers in virtually all kinds of industries are assuming increasing responsibility while still ensuring that they (142) their routine requirements.

The role is expanding but is often made more difficult because of the lack of management training receiveD、A、recently retired management consultant once said, "Most managers are promoted because of their expertise.And it is probable that for every one manager who has received professional training there are ten who’ve had no formal training." It is inevitable that managers are faced with many issues and problems (143) a daily basis.A、professor who also heads a leading management consulting company argues that organizations seek to recruit talented individuals without realizing that talent can be difficult to manage. Managers have to work with a range of people: the talented, the team players, those who handle stress well and those who don’t.
A．for
B．on
C．with
D．through