the workers often complain about ( )【work】for too long every day.

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theworkersoftencomplainabout()【work】fortoolongeveryday.theworkersoftencomplainabout()【work】fortoolon

the workers often complain about ( )【work】for too long every day.
the workers often complain about ( )【work】for too long every day.

the workers often complain about ( )【work】for too long every day.
the workers often complain about ( working )【work】for too long every day.

working...

working,因为前面有about,是介词,介词后加动名词