单选题：What is the meaning of "working round the clock"?

题目内容：

What is the meaning of "working round the clock"? A．Repairing clocks.
B．Making clocks.
C．Working with a clock nearby.
D．Working day and night.

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

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