单选题:Smart devices have become the master mainly becauseo________

题目内容:
Smart devices have become the master mainly becauseo__________. A.everybody is on call all the time.
B.bosses invade their employees' free time.
C.managers easily change their minds at the last moment.
D.employees find it harder to distinguish between real work and make-work.

参考答案:
答案解析:

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