Stipulated in the contract this work must be completed within a year.
合同规定这项工作必须在一年内完成。
This work must be finished before tomorrow.
此工作必须在明天以前完成。
This work must be done at once.
这件工作必须立刻做。
This work must be done by you, and not by me.
这件工作必须由你做，而不是我来做。
This work must be done by you, and not by me.
这件工作必须由你做，而不是我来做。
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