填空:How long do they ______doing the work?The work ____them 20 hours.

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填空:How long do they ______doing the work?The work ____them 20 hours.
填空:How long do they ______doing the work?The work ____them 20 hours.

填空:How long do they ______doing the work?The work ____them 20 hours.
How long do they spend doing the work?
The work takes them 20 hours.