According to Haefner, which of the following might be the disadvantage of flexible schedules?（ ）

According to Haefner, which of the following might be the disadvantage of flexible schedules?（ ）

A.

People may not concentrate on their work.

B.

People cannot earn as much as they did before.

C.

There are more technical requirements for employees.

D.

There is no clear distinction between work and leisure.

正确答案是D