those flowers need watering twice a week.改为同义句,those flowers need()()()twice a week.

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thoseflowersneedwateringtwiceaweek.改为同义句,thoseflowersneed()()()twiceaweek.thoseflowersneedwateringtw

those flowers need watering twice a week.改为同义句,those flowers need()()()twice a week.
those flowers need watering twice a week.改为同义句,those flowers need()()()twice a week.

those flowers need watering twice a week.改为同义句,those flowers need()()()twice a week.
to ,be ,watered

should be watered